Paper Anatomy

WST01 is a 90-minute written exam worth 75 marks, confirmed identical across all 14 series this course's own research pass reviewed (Jun 2019 → Jan 2025) and independently re-checked here directly against a real paper: the January 2023 WST01/01 front page states, verbatim, "Time 1 hour 30 minutes" and, in its own Information section, "There are 6 questions in this question paper. The total mark for this paper is 75." There is no Section A/B/C anywhere on that front page, in its instructions, or anywhere in the matching mark scheme — WST01 is shaped the way WMA13 is, not the way WEC13/WBS13 are: one flat sequence, each question its own self-contained mark tariff, not a Section A/B/C split with different item types in each.

The number of questions is real but not fixed by the spec — this course's own research pass counted 6, 7 or 8 across the 14 series reviewed, and January 2023 specifically (independently confirmed here, filling a gap that series' own count left open in the earlier research pass) has 6. What IS fixed, on every series checked, is the 75-mark total and the 90-minute duration; the question count is Pearson's own choice each series, not a promise a lesson should make to a student. Every question also states its own total explicitly, printed at the point of the last part — "(Total for Question 1 is 10 marks)" is the literal, verbatim closing line under Question 1 on the real January 2023 paper.

Answering all questions is compulsory — no choice of question, on this paper or on any other Pearson IAL Maths unit. The spec's own Assessment Information (§S1.2) states "Students must answer all questions," and the real question paper's own Instructions match it independently: "Answer all questions and ensure that your answers to parts of questions are clearly labelled," reinforced again under Advice as "Try to answer every question."

Reading a full real series end to end gives a genuine per-question mark breakdown, not an assumed one: January 2023's six questions carry 10, 10, 11, 13, 17, 14 marks respectively — summing to exactly 75. The spread matters more than the flat average does. The smallest question (Q1, reading a histogram and computing summary statistics) is 10 marks, barely over a tenth of the paper; the largest (Q5, standardisation and conditional probability under a Normal model) is 17 marks, close to a quarter of the whole exam in one question — a genuinely uneven distribution the flat average below can't show on its own.

The real front page states its own pacing rule directly, in Pearson's own words rather than this course's derived arithmetic: "The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question." At the paper-wide average, 90 minutes over 75 marks works out to 1.2 minutes — 72 seconds — per mark (the identical average WMA13 shares, since both units are built to the same 90-minute/75-mark shape). That average is the right starting point for a rough plan, and the wrong number to trust question by question once a real paper is in front of you: budget against each question's own printed marks, exactly as Pearson's own front page instructs, not against the flat average applied blindly across a 10-mark question and a 17-mark question alike.

Every item on the real WST01 record is free-response and multi-part — there is no multiple-choice item anywhere in this paper's own structure, the same shape WMA13 has and WEC13's Section A doesn't. Worth stating plainly since it cuts the other way against how this course's own lessons are built: the MCQ blocks inside WST01's individual content lessons (prequestions, retrieval-practice MCQs) are VERIDIAN-original teaching tools, built for spaced retrieval, not a reproduction of the real exam's own item format. A student should never expect to see a lettered multiple-choice item on the real paper.

WST01's real command verbs describe an OPERATION, not a levels band the way WEC13's 'Evaluate'/'Discuss' split does — there's no equivalent essay-vs-short-item command-word ladder here. Confirmed directly from the real January 2023 paper: "Use the histogram to complete the frequency table," "Estimate the number of people who took less than 16 minutes," "Find an estimate for the mean," "use linear interpolation to estimate the interquartile range," "Find the probability that...," "Given that all three marbles selected are the same colour, find the probability that they are all green." This course's own wider research record adds further real verbs from other series: "state," "explain," "comment on," "give a reason," and — recurring across every topic on the paper, not confined to one series — "show that."

WST01 also carries its own real, spec-published AO1-AO5 weighting (spec pp.68-69, all figures out of 75): AO1 (recall/select/use knowledge of facts, concepts, techniques) 20-25; AO2 (construct rigorous arguments, logical deduction, manipulation) 20-25; AO3 (recall/select/use knowledge of standard mathematical models; interpret results in terms of the original situation, including assumptions and refinement) 15-20; AO4 (comprehend translations of realistic contexts into mathematics; use results to make predictions/comment on context) 5-10; AO5 (use calculator technology/formulae booklet/tables accurately and efficiently; know when not to use them; give answers to appropriate accuracy) 5-10. AO3's 15-20/75 range is unusually high for this qualification — the Pure Mathematics units cap AO3 far lower on the same spec table (P1 at 5-15, P2 through P4 at just 5-10) — a comparison this course's own research pass draws as its own analysis of the published table, not a ranking Pearson states outright. Why that range matters in practice, and how a topic with almost no standalone past-paper question of its own can still be worth a fifth of the paper, is the entire subject of mathematical-modelling-in-probability-and-statistics.ts, registered earlier in this paper's own reading order — not repeated in depth here.

One honest limit on that AO table, checked directly rather than assumed: it is published once, at unit level, as an aggregate range for the whole 75-mark paper — it is never printed on an individual mark-scheme line. Every one of the 75 individual mark points across all six questions of the real January 2023 mark scheme carries only an M, A, or B code (plus the standard abbreviations — cao, oe, ft, dep, cso, SC); not one of them is tagged AO1 through AO5. A WST01 mark scheme tells you exactly how a mark was earned; it never tells you which assessment objective that specific mark counted toward.