Paper 1 is 1 hour 30 minutes and 35 marks. Three sections. Sections A and B are compulsory, and in Section C you choose one question from two.
The single most useful thing to understand about this paper is the mark distribution, because it decides everything else. Section C is the largest single section of the paper, worth 15 of the 35 marks, or about 43%.
| Section | What you get | Marks | Approximate time |
|---|---|---|---|
| A | Two compulsory content-based questions, 4 marks each | 8 | 20 minutes |
| B | Two compulsory questions applying your knowledge to a new situation, 6 marks each | 12 | 30 minutes |
| C | One concept-based extended response, chosen from two | 15 | 40 minutes |
You also get five minutes of reading time before the clock starts, as in every IB exam.
Why the mark split decides your strategy
Section A is 23% of the paper. Section B is 34%. Section C is 43%.
Converting mark share into time share is the cleanest way to allocate your ninety minutes, and it produces the 20 / 30 / 40 split above. It also produces a rule that protects you on the day.
A four-mark question cannot earn you more than four marks no matter how long you spend on it. Every extra minute in Section A is a minute taken from the fifteen-marker. If you overrun on a short answer, stop, even mid-sentence, and move on.
That sounds harsh. It is the discipline that protects your grade.
You are allowed to do Section C first
Section C is printed last, but nothing requires you to answer it last.
There is a good case for starting there. It is the most demanding question on the paper and the one that suffers most from being rushed. Doing it while you are fresh, rather than with twenty minutes left and rising panic, often produces a better answer and a calmer exam.
If you do this, two rules keep it safe.
Spend a maximum of 45 minutes on it, then move on regardless of where you are. And leave space between your paragraphs and at the end of the response, so that if you finish Sections A and B early you can go back and develop it rather than squeezing additions into a margin.
What each section is actually testing
The three sections do not want the same thing from you, and answering one in the style of another is a common way to lose marks that were available.
Section A is about your knowledge of the content itself, drawn from the biological, cognitive and sociocultural approaches. Four marks each, and the questions are short. This is the part of the paper closest to straightforward recall and explanation, though even here an explained example does more work than a listed one.
Section B gives you a situation you have not seen and asks you to apply your knowledge to it. Six marks each. The material in front of you is not there for decoration. An answer that explains a theory well but never touches the specific scenario is answering a Section A question in the wrong section.
Section C is different in kind. The command terms are AO3 only. Evaluate, discuss, to what extent. You will never be asked to describe or outline here, which means an answer that only explains content cannot reach the top bands however accurate that content is.
Every Section C question is built the same way. It names a context, one Area of Study inside that context, and one of the six concepts. That is the whole architecture, and the question can only draw on the Area of Study column of the syllabus tables, not the learning objectives beside them.
The thing about Section C that gets misread
Knowledge of the specific details of research studies is not assessed in Section C.
Be careful about what that does and does not mean. It does not mean studies are irrelevant. You still need evidence to argue with, and an answer with no evidence in it will struggle. What it means is that nobody is checking whether you remembered the sample size or the year.
The practical consequence is about where your revision hours go. Time spent drilling study details is time not spent learning to argue with the evidence you have, and it is the second skill the section is built to reward.
How long should your answers be
There is no word count in the mark scheme, and the honest answer is that it depends on how fast you think and write. What follows is a range observed in stronger sample responses, not a target to hit.
| Section | Typical range in stronger responses |
|---|---|
| A | 150 to 220 words |
| B | 200 to 300 words |
| C | 650 to 800 words |
Use these to check whether you are wildly off, not to count. Answering the question fully in the time you have is much more important than landing inside a range.
If your Section A answers are running to 400 words, that is worth noticing, because those words are coming out of Section C. If your Section C answer is coming in at 300 words, that is also worth noticing, for the opposite reason.
Where to go next
Each section rewards a different kind of practice, and each one has its own traps.
- Section A: how to answer the short questions
- Section B: how to approach the unseen scenario
- Section C: how to answer the 15-mark concept question
Before any of that, one habit is worth building now. When you meet an Area of Study, do not stop at what the psychology says. Ask which of the six concepts it makes live, and what each one lets you question about it. That is the skill Section C is built to measure, and it is the only part of this paper you cannot cram.
If you want a starting set of Paper 1 materials for the 2027 course, the PsychExcel Starter Library is free.