10 Fatal ACCA PM Mistakes: Examiner Report Evidence (2024–2025)

10 Fatal ACCA PM Mistakes

The 10 most common ACCA PM exam mistakes, drawn directly from official examiner reports for June 2024 through December 2025 sittings, cost candidates between 10 and 30 marks each sitting. With PM pass rates stuck at 40–43% (ACCA official data), avoiding these specific errors is the fastest route to joining the passing minority. This guide names each mistake, shows you exactly which examiner report flagged it and which exam question it appeared in, and gives you a concrete fix.

Mistake 1: Burning Time on Hard Section A Questions

Examiner evidence: Flagged in all four reports (J24, SD24, MJ25, D25). The examiner consistently warns that candidates spend 8–10 minutes on a single 2-mark OT question while leaving easier questions unanswered.

Why it costs marks: Section A is worth 30 marks across 15 questions. At 1.8 minutes per mark, you have roughly 3.6 minutes per question. Students who get stuck on one difficult calculation and spend 10 minutes on it often leave 3–5 questions blank at the end — an automatic loss of 6–10 marks. Since there is no negative marking, leaving any question blank is never justified.

The fix: Apply a strict 2-minute rule. If you cannot identify the correct approach within 2 minutes, flag the question and move on. Return to flagged questions only after completing Sections B and C. For questions you genuinely cannot answer, eliminate obviously wrong distractors and make your best guess — a 25–50% chance of 2 marks is always better than zero.

Mistake 2: Writing Generic Answers That Ignore the Scenario

Examiner evidence: This is the single most criticised error across every report. In the March–June 2025 report, the examiner noted that candidates answering the 3Es question for Eastern Hospitals Trust restated textbook definitions of Economy, Efficiency and Effectiveness instead of applying them to the specific hospital data provided. In December 2025, candidates analysing Balanced Scorecard performance for Klen Co wrote generic comments that could apply to any business rather than referencing the company’s specific KPIs and targets.

Why it costs marks: The examiner has explicitly stated that generic answers earn very few marks. Section C marking guides award marks for scenario-specific observations — referencing actual numbers, departments, products, or decisions from the question. A candidate who writes a perfect textbook answer without linking it to the scenario can score as low as 2–3 marks on a 10-mark requirement.

The fix: Before writing any Section C answer, underline or note 3–5 specific data points from the scenario that you will reference. Every paragraph you write should mention at least one concrete figure or fact from the question. If your answer could apply equally to any company, it is too generic.

Mistake 3: Ignoring the Required Headings in Section C

Examiner evidence: In the March–June 2025 report, the examiner criticised candidates who did not structure their 3Es answer under separate Economy, Efficiency and Effectiveness headings despite the requirement explicitly asking for this structure. In December 2025, candidates failed to use the four Balanced Scorecard perspectives (Financial, Customer, Internal Process, Learning & Growth) as headings when the question required analysis under each perspective. In the September–December 2024 report, candidates answering divisional performance questions did not separate their analysis by division as requested.

Why it costs marks: ACCA examiners mark using structured marking guides that allocate specific marks to each heading or sub-requirement. If your answer does not follow the requested structure, the examiner physically cannot match your points to their marking guide, and valid points may be missed entirely. This can cost 4–8 marks on a single question.

The fix: Read the question requirement twice before writing. If it says “discuss under the headings of Economy, Efficiency and Effectiveness,” create three clearly labelled sections. If it says “analyse using the Balanced Scorecard perspectives,” create four headed sections. Mirror the exact language from the requirement in your headings.

Mistake 4: Listing Bullet Points Instead of Explaining

Examiner evidence: In the March–June 2025 report, the examiner noted that candidates asked to explain the practical difficulties of implementing activity-based budgeting (Quality Tyres Co question) wrote single-phrase answers such as “ABB is costly” or “ABB is time-consuming” without any development. In the June 2024 report, the same pattern appeared in Acorn Care Co, where candidates listed points about the 3Es without explaining why each point mattered.

Why it costs marks: When a question uses the verb “explain” or “discuss,” the marking guide typically awards 2 marks per point: 1 mark for identifying the issue and 1 mark for developing it (explaining why, how, or what the consequence is). A bare bullet point earns at most 1 mark and often zero, because the examiner cannot confirm you understand the concept without the development.

The fix: Use the “point + consequence” method for every discussion mark. State your point in one sentence, then add a second sentence explaining the implication. For example: instead of “ABB is costly,” write “Implementing ABB requires significant investment in data collection systems and staff training because each activity must be individually analysed, costed, and linked to specific cost drivers — this is particularly burdensome for organisations with hundreds of distinct activities.”

Mistake 5: Mixing Inter-Divisional Transfers with External Sales

Examiner evidence: Highlighted in the September–December 2024 report (Caroline Co question) and again in the December 2025 report. The examiner specifically stated that candidates combined interdivisional transfer revenue with external sales in divisional profit statements, making it impossible to assess each division’s true performance. For a deeper understanding of this topic, see our guide to PM transfer pricing questions.

Why it costs marks: The whole point of divisional performance measurement is to evaluate each division independently. When you mix internal transfers with external transactions, your profit figures are meaningless and your subsequent analysis of ROI, RI, or transfer pricing impact is built on incorrect numbers. This error typically cascades through the entire question, costing 6–12 marks.

The fix: In any divisional profit statement, always create separate line items for: (1) external revenue, (2) inter-divisional transfer revenue, (3) external costs, and (4) inter-divisional transfer costs. Include a company-total column that eliminates the inter-divisional transactions. Label each line clearly so the examiner can follow your logic.

Mistake 6: Including Sunk Costs in Relevant Costing Decisions

Examiner evidence: Flagged in the June 2024 report (Global Scan Co shutdown decision), the September–December 2024 report (Hurstmid Co make-or-buy decision), and the December 2025 report (Daly Co). Candidates repeatedly included past expenditures, allocated head-office overheads, and depreciation of existing assets in their relevant cost calculations, arriving at wrong recommendations.

Why it costs marks: Relevant costing questions appear in Section B or C at nearly every sitting. The fundamental principle — only future, incremental cash flows are relevant — is tested relentlessly because it is the foundation of all management accounting decisions. Including a single irrelevant cost can flip your recommendation from “continue” to “shut down” (or vice versa), losing you both the calculation marks and the discussion marks that follow.

The fix: Before starting any relevant costing calculation, create a two-column classification list: “Relevant (future, incremental)” and “Irrelevant (sunk, committed, allocated).” Go through every cost in the scenario and classify it explicitly. Only then proceed to the calculation. This 2-minute step prevents the cascading errors that cost candidates 8–15 marks.

Mistake 7: Poor Spreadsheet Technique in Section C

Examiner evidence: Raised in all four reports. The March–June 2025 examiner noted that candidates either typed hard-coded numbers instead of using cell references and formulas, hid their workings, or attempted very long formulas rather than building calculations in stages. When a single input error occurs in a long formula, the examiner cannot award any follow-through marks because the method is not visible.

Why it costs marks: Section C questions require you to show workings in the CBE spreadsheet. If you hard-code your final answer without visible method, you earn zero marks when the answer is wrong (even if your approach was correct). If you use staged formulas with cell references, the examiner can see your method and award follow-through marks even when an early figure is incorrect. This difference can be worth 4–8 marks per question.

The fix: Practise on the ACCA Practice Platform from the start of your studies. Build every calculation in stages: put inputs in clearly labelled cells, reference those cells in intermediate calculations, and only produce the final answer by referencing intermediates. Use clear headings above each working area. This is not just good exam practice — it mirrors professional spreadsheet standards.

Mistake 8: Restating KPIs Without Analysis in Balanced Scorecard Questions

Examiner evidence: In the December 2025 report (Klen Co), the examiner noted that candidates simply listed percentage changes in KPIs from the scenario without interpreting what those changes meant for the organisation’s strategic objectives. Similar feedback appeared in the June 2024 report where candidates restated Balanced Scorecard figures without linking them across perspectives or to the company’s stated goals.

Why it costs marks: The examiner awards marks for analysis, not data transcription. Stating “customer satisfaction increased from 78% to 85%” earns zero analysis marks. Explaining that this increase suggests the recent investment in staff training (learning & growth) is translating into improved service delivery (internal process), which is now reflected in customer perception — that earns analysis marks across multiple perspectives.

The fix: For every KPI you reference, complete this chain: (1) state the metric and its movement, (2) compare it to a target, benchmark, or prior period, (3) explain what it means for the objective in that perspective, and (4) where possible, link it to another perspective. This is the analytical depth the examiner is looking for. Study the Building Block Model alongside the BSC to build stronger analytical frameworks.

Mistake 9: Calculating ROI but Missing the Behavioural Discussion

Examiner evidence: In the September–December 2024 report (Yetgo Co and GDR Division questions), the examiner criticised candidates who calculated ROI and residual income correctly but then failed to discuss the behavioural implications of using ROI as a bonus metric. In the December 2025 report, the same issue appeared: candidates could compute divisional performance metrics but could not explain why a manager might reject a project that exceeds the company’s cost of capital if accepting it would reduce the division’s current ROI below the bonus threshold.

Why it costs marks: Divisional performance questions almost always have a “discuss” or “evaluate” component worth 6–10 marks. Candidates who only provide calculations typically score 8–10 out of 20, leaving the discussion marks entirely on the table. The behavioural and goal-congruence discussion is where the examiner differentiates between candidates who understand management accounting and those who can merely calculate.

The fix: When you see ROI or RI in a question requirement, immediately plan for both a calculation section and a discussion section. In the discussion, always address: (1) goal congruence — does the metric encourage managers to act in the company’s best interest? (2) dysfunctional behaviour — what perverse incentives does the metric create? (3) comparison — would RI lead to different decisions than ROI, and why? For more on this topic, see our guide to divisional performance and transfer pricing.

Mistake 10: Treating Big Data as a Perfect Prediction Tool

Examiner evidence: In the September–December 2024 report, the examiner specifically noted that candidates incorrectly stated that big data analytics ensures decisions are free from bias and provides certainty about future outcomes. Candidates treated data analytics as infallible rather than as a tool with significant limitations including data quality issues, algorithmic bias, and the fundamental uncertainty of business forecasting.

Why it costs marks: Big data questions in Section A and B test whether you understand both the benefits and the limitations of data analytics. Stating that big data eliminates uncertainty or guarantees accurate predictions is factually wrong and demonstrates a lack of professional judgement — the examiner penalises this directly. These OT questions are typically worth 2 marks each, and several may appear in a single sitting.

The fix: When answering any big data question, remember the four Vs (volume, velocity, variety, veracity) and that the “veracity” dimension explicitly acknowledges data quality concerns. Big data improves the evidence base for decisions but does not eliminate uncertainty, cannot predict black-swan events, and is only as good as the data collected. Always include limitations alongside benefits in any discussion answer.

Summary: All 10 Mistakes at a Glance

FAQ

What is the most common reason for failing ACCA PM?

According to examiner reports from 2024–2025, the most common reason is writing generic, undeveloped answers in Section C that do not reference the specific scenario data. This single mistake can cost 10–15 marks across two constructed-response questions, which is often the difference between passing and failing.

How many marks does poor time management cost in PM?

Candidates who spend too long on difficult Section A questions and leave 3–5 questions blank lose 6–10 marks immediately. Combined with reduced time available for Section C (the highest-value section at 40 marks), poor time management can cost 15–20 marks in total.

Why does the PM examiner keep criticising the same mistakes?

The examiner reports from June 2024 through December 2025 show the same issues repeated at every sitting because new cohorts of students make the same preparation errors: not reading examiner reports, not practising on the CBE platform, and not developing written analytical skills alongside calculation technique. Reading the examiner reports before your exam is one of the highest-value study activities available.

How can I avoid these mistakes in my PM preparation?

Follow a structured study plan that includes timed mock exams, deliberate practice of Section C narrative answers, and systematic review of examiner reports. Our complete guide to passing PM provides a week-by-week plan built around avoiding these exact errors. For approved study materials, see the BPP PM Coursebook and Practice Kit.

Is PM the hardest Applied Skills paper?

Yes. PM consistently records the lowest pass rate among the five Applied Skills papers at 40–43%, compared to TX (54–55%), FR (48–50%), FM (46–51%), and AA (44–47%). The difficulty lies not in the maths but in the requirement to apply concepts to scenarios and produce structured, analytical written responses under time pressure. See the ACCA PM complete guide for full syllabus and exam format details.

Last verified: April 2026. Examiner report insights based on published ACCA PM reports for June 2024, September–December 2024, March–June 2025, and December 2025 sittings. Pass rate data from ACCA Global. This guide is reviewed every 6 months.