Having marked hundreds of A-Level Psychology exam papers, the same mistakes appear year after year. The good news is that most are easy to fix once you know what examiners are looking for. Here are five of the most common errors that can cost students valuable marks in Psychology exams.
1. Not Reading the Command Word
Students often launch into everything they know about a topic without paying attention to the command word.
For example:
- Outline = AO1 knowledge only.
- Evaluate = AO3 evaluation only.
- Discuss = a combination of knowledge and evaluation.
Always identify the command word before writing your answer.
2. Writing Too Much AO1 in Evaluation Questions
A common mistake is spending half the answer describing a study when the question asks for evaluation.
If a question is worth 16 marks and asks you to evaluate, the majority of your answer should focus on strengths, limitations and discussion points rather than detailed descriptions of research.
3. Ignoring the Scenario
Application marks are often dropped because students write a textbook answer instead of referring to the person in the question.
Use names, situations and details from the scenario throughout your response.
4. Confusing Similar Concepts
Some of the most frequently confused concepts include:
- Ethics and social sensitivity
- Reliability and validity
- Compliance and identification
- Correlation and causation
Students should make sure they can clearly define and distinguish between commonly confused terms.
5. Not Developing Evaluation Points
Many students identify a strength or limitation but fail to explain why it matters.
Instead of writing:
“One strength is that the study had high ecological validity.”
Explain the consequence:
“This means the findings are more likely to reflect real-life behaviour, increasing the usefulness of the research.”
Development is often what moves answers into the higher mark bands.
Final Thoughts
Exam success in Psychology is not just about knowledge. It is also about understanding what the question is asking and applying effective exam technique. Small improvements in exam skills can make a significant difference to overall grades.

