Question Selector Guide

Provenance: compiled 2026-09-29. This document does no new primary-source PDF extraction. It is built from a full read of research/veridian/WMA11-verified-facts.md (§2–§4, §7, and the Lesson-audit log's Q9 entry specifically), cross-checked against the three existing WMA11 technique-hub documents that already cover adjacent ground — content/veridian/curriculum/wma11/paper-anatomy.ts (structure, timing, mark-code definitions), forge-exam-technique-guide.md (§1's timing tables, §2's mark-writing technique, §5's exam-day protocol) and forge-battle-card.md (§4's tariff reminders, §5's error-pattern warnings) — specifically so this document does not restate what they already establish. What follows is a synthesis and re-purposing of already-verified facts for a question this hub had not yet asked directly: not "how do you write a solution" or "what's the timing budget," but "in the moment you're stuck and behind schedule, what do you do." Every quotation is a short fragment, under roughly fifteen words, with attribution; longer examiner-report and mark-scheme statements are paraphrased rather than reproduced. Not affiliated with or endorsed by Pearson Edexcel.

#WMA11 — Question Selector Guide

#Pearson Edexcel IAL Mathematics, Unit 1: Pure Mathematics P1

#0. What this document is, and what it deliberately doesn't repeat

This is not a fourth timing table, a fourth mark-code glossary, or a fourth error-pattern list. paper-anatomy.ts and forge-exam-technique-guide.md §1 already give the real 90-minute/75-mark budget and the two fully-worked, mark-by-mark timing tables (January 2023 and January 2024). forge-exam-technique-guide.md §2 already covers how to write a solution so a marker can see the method. forge-battle-card.md already lists the paper's highest-damage error patterns. None of that is reproduced here.

What this document adds, new to this hub: §2, a decision tool built from the paper's own M/A/B/dM/ddM mark-type structure — not how to write a full solution, but what to write down in the last thirty to sixty seconds before you decide to abandon a question and move to the next one. §3, a short, evidenced list of the specific real questions this course's research has found with a documented poor return on continued time — not generic "this topic is hard" advice, but named series, named marks, and a corrected reading of one statistic (Jan 2023 Q9) that an earlier pass in this same course's own research initially mis-scoped.

#1. The premise this guide has to start from: there is close to no question to select

A "question selector guide" usually implies choosing which questions to attempt, and in what order. WMA11 barely supports that framing, and this document should not pretend otherwise. The paper has no Section A/B/C structure — every real mark scheme and question paper checked in this course's research describes it as one flat, numbered, compulsory sequence — and candidates must answer every question on it (facts bank §2). The question count itself varies by series (10 or 11, not fixed by the spec) but that variation changes how many questions carry the fixed 75 marks, not whether any of them are optional.

So the honest content of a selector guide for this specific paper is not which question to do — that part is fixed — but two narrower questions this hub had not yet answered directly: what is worth writing down before you give up on a question you're stuck on (§2), and which specific, real questions have a documented history of costing disproportionate time for a low return, so that a stuck-for-too-long decision in the exam hall is informed by evidence rather than a guess (§3). Order-of-attempt itself is not addressed further here: no examiner report or spec document reviewed anywhere in this course's WMA11 research recommends attempting questions out of their printed order, and inventing such a recommendation would be exactly the kind of filler this document's brief rules out. The only order this research supports is the paper's own printed one, paced against the printed marks — already established in forge-exam-technique-guide.md §1.

#2. Before you move on: what to bank in the last thirty seconds

Every mark on this paper is coded M, A, B, dM or ddM (paper-anatomy.ts; facts bank §3). That coding is not just a scoring label — read the right way, it is a direct guide to which marks survive an incomplete attempt and which don't. The salvage order below is this document's own synthesis of that structure for a triage decision; the mark-type facts themselves are already verified in forge-exam-technique-guide.md §2 and are not re-derived here, only re-purposed.

First, grab any B mark you can state outright. A B mark is "independent accuracy... where there is no method" — awarded for a stated fact or result on its own, no working required. The clearest real example on this paper: Jan 2023 Q9(a) asks for the period of tan x, worth one mark, B1, for the bare answer "π" — no derivation is credited or needed. If a part of a question you're about to abandon has a fact you simply know, write it down before you move on; it costs seconds and the mark scheme does not ask for anything else.

Second, quote the formula, even if you don't substitute into it correctly. An M mark is earned by "a correct method or an attempt at a correct method" — and the paper's own general marking guidance states plainly that the formula "should be quoted first," because a method mark shown this way can survive a slip in the substitution that follows it, where an unlabelled jump straight to numbers "may be lost if there is any mistake in the working." Writing the quadratic formula, the sine rule, or ∫xⁿ dx = xⁿ⁺¹/(n+1) before you attempt to use it is a real, bankable mark even if you then run out of time to finish.

Third, attempt one line of substitution, even without finishing. The differentiation and integration method marks are earned per term, not per expression — any single correct power-shift on any one term is enough to trigger the M mark, whatever the rest of the line looks like. One visible step is worth writing down before you leave a question, rather than nothing.

Understand what you lose, so you don't chase it. An A mark is dependent: it "can only be awarded if the previous M mark has been earned" — "M0 A1 is impossible." A dM or ddM mark depends on one or two earlier method marks being genuinely, visibly attempted before it. These are the marks an abandoned question loses first, and they are not recoverable by writing down a guessed final answer with no working behind it — a plausible-looking final line with no visible route to it is scored as an answer, not a method, on this paper. Knowing this in the moment is itself useful: it tells you that stopping after the formula-and-one-line stage above has already captured what was realistically recoverable, and that spending three more minutes chasing the dependent marks on a question you're genuinely stuck on is a worse trade than moving to a fresh question where the same three minutes might capture a full independent mark elsewhere.

The practical sequence, in order, before you leave a question you've decided to abandon: state any fact you know outright (B) → write the relevant formula (M) → attempt one line of substitution or one term's power-shift (M) → move on. This costs well under a minute and, per the mark-type structure above, can turn a zero into one or two banked marks.

#3. Questions with a documented poor return on continued time

This is not the same list as forge-battle-card.md's "top 5 danger warnings" — that list names error patterns to avoid while attempting a question. This one names specific, real questions where the whole cohort's own documented outcome argues for capping how long you spend on them if you're already behind schedule elsewhere on the paper. Series coverage behind this list is uneven (facts bank §7) — five series have a fully-read examiner report (Jan 2019, Oct 2020, Oct 2021, Jan 2023, Jan 2025); this is what surfaced while re-reading those for whole-question or cohort-level outcome language, not a systematic re-sweep of every series for this exact signal.

• Jan 2023 Q9, all four marks (state the period of tan x, one mark, plus three graph-intersection root-counting parts, one mark each). The examiner report's own opening line for this question, read as a whole: under 5% of the cohort achieved full marks, "more than half of all candidates scored no marks," and roughly one in ten did not attempt it at all. This exact statistic was, for a time, mis-scoped elsewhere in this course's own research as describing the one-mark period sub-part alone — a genuine misattribution this course's own lesson-audit log later found and corrected (see WMA11-verified-facts.md's lesson-audit entry for trig-graphs-period-and-domain.ts). Correctly scoped, it describes the whole four-mark question, not the period fact by itself. The practical read: the period-of-tan-x mark is a free B1 if you know the fact — grab it in seconds regardless of what else you do with this question. The three root-counting sub-parts are a different skill (reading intersection counts off a graph, not periodicity) and, on this same whole-question statistic, are where most of the cohort's marks on Q9 went missing. If you're behind schedule when you reach this question, banking the one fact and moving on is the single most evidence-backed cut in this research.
• Oct 2021 Q3(i), 3 marks ("solve 3/x > 4"). The examiner report states this part "was missed out altogether by a significant number of candidates" — a real slice of the cohort's own triage decision was to skip it entirely. Of those who did attempt it, the single most common answer banked only one of the three marks (the boundary value alone, without the credited x² method). If the "multiply through by x²" route isn't solid under pressure, that one boundary value is the cheap, fast partial grab; hunting for the full method here under time pressure was not, on this evidence, what most of the cohort managed to do anyway.
• Oct 2020 Q6(c), 5 marks (finding points on a line a fixed distance from a given point). The examiner report calls the wider Q6 "one of the most challenging questions on the paper," and on this specific part, most candidates "failed to score more than 2 of the 5 marks." A specific, named reason for the shortfall: candidates who assumed a 3-4-5 right-triangle relationship measured from the origin, rather than from the midpoint of the given segment — a setup error, not a computational one. If you reach this question already behind schedule, treat it as documented-hard rather than assume you're simply moving too slowly.
• Jan 2019 Q2 (laws-of-indices rearrangement). The examiner report states plainly that "the majority of candidates scored no marks" on this question, attributed to difficulty applying the index laws correctly. It sits early in the paper — a reminder that a question's position near the start doesn't mean it's automatically safe, and that recognising you're stuck here early is worth acting on rather than assuming the next question will go better by default.

One real, positive contrast worth setting alongside that list, so it doesn't read as universally discouraging: Jan 2023 Q7(c), a direct value-substitution step, was "answered well" per its own examiner report — immediately after Q7(b) in the same question, a transformation-description part where a fully correct answer was "extremely rare." The lesson is not that Q7 in general is safe or unsafe, but that difficulty in one part of a multi-part question does not reliably predict the next part; don't let a rough start on part (b) talk you out of a confident attempt at part (c) of the same question.

#4. What this guide is not

• No attempt-order recommendation beyond the paper's own printed sequence. Restated here because this document's own title invites the question — see §1 for why nothing further was found or invented.
• No frequency claim above is a prediction. Every finding in §3 is confirmed in the specific series this course's research has fully read, not a probability that the same question or statistic recurs in a future series — the same convention this hub's other WMA11 documents already state and this one inherits (facts bank §7).
• No grade boundary, pass mark, or "marks needed for a grade" claim appears anywhere here, for the same reason none appears elsewhere in this hub: no such figure has been independently verified against Pearson's own boundaries document for this unit.
• §3's list is not exhaustive. It reflects a targeted re-read of the five fully-read examiner reports for whole-question or cohort-scale outcome language, not a fresh, systematic sweep of all nine series this course's research has touched — the two series confirmed as genuine mark schemes but never mined question-by-question (Oct 2022, Jan 2024) could contain further examples that this pass did not look for.
• §2's salvage ordering is this document's own synthesis of already-verified mark-type facts, not a Pearson-stated priority list — the underlying mark-type definitions are sourced throughout; the ranking built from them for a triage decision is this hub's own reasoning, stated as such here rather than presented as a separately-cited finding.