Does Stress Before an Exam Affect Your Memory? What Research Shows

Does stress before an exam affect your memory? Usually, yes, but it depends on when the stress hits. Research on stress and memory finds that stress just before or during recall tends to make remembering harder, while stress just after studying tended to help. Practice with tests may also protect what you learned, though that finding is not settled.

This post sets out what four studies found, where they disagree, and how to prepare. It is not medical advice, and the studies below are experiments, and none of them tested a real exam.

Does stress before an exam affect your memory? The short answer

It depends on the moment. A 2017 meta-analysis (a study that pools many studies) combined 113 experiments with 6,216 people and split the results by when the stress came (Shields et al. 2017).

• Stress before or during learning: memory was worse. The exception was a very short gap between the stress and the learning, with material tied to the stressor.
• Stress just after learning: memory was better, unless the stress happened in a different place from where the studying happened.
• Stress just before or during recall: memory was worse, and more so for emotional material than neutral material.

The last line is the one that matters in an exam room. The same review also found that how much cortisol (a stress hormone) the body made did not predict the size of the memory effect. So "I felt very stressed" and "I blanked" are linked, but a stress level alone does not tell you how much you will forget.

Why you can blank on something you know

A second meta-analysis looked only at studies where people were given cortisol by mouth, so the dose was controlled (Het et al. 2005). Across 16 studies, cortisol given before recall lowered memory (an average effect of d = -0.49, a moderate drop). Cortisol given before learning had no effect on average.

Put together, the two reviews point the same way: the trouble is mostly at the moment of getting information out, not in what you stored. That fits the feeling of an exam blank. Two limits apply. These studies tested lists of words or pictures, not a chemistry exam. And the effect on any one person is not predictable from an average.

Does stress while you study make things worse?

The 2017 review found that stress before or during learning tended to impair memory. A week of study spent in dread fits that finding, though the review pooled experiments, not study weeks, and it did not test whether lost sleep sits in between. If you want the sleep side, read does sleeping after studying help you remember.

The same review found stress after learning tended to help, and that is not a plan. Nobody should arrange to be stressed. It only shows the effect depends on timing, so "stress is bad for memory" is too simple.

Can practice protect your memory from stress?

Smith, Floerke and Thomas (2016) tested this in a Science paper. People learned material either by restudying it or by retrieval practice, which means taking practice tests. A day later, half were stressed before a memory test. Those who had restudied showed the usual stress impairment. Those who learned by retrieval practice did not. The authors suggest stress may matter less when the memory is stronger.

A 2026 study tried to repeat and extend this (Klier and Buratto 2026). It used 56 male participants who learned Swahili and Portuguese word pairs by retrieval practice. The stress task raised cortisol, yet recall 48 hours later was not worse under stress, even for the harder items. The study had no restudy group, so it cannot show that retrieval practice beat anything. It does fit the idea that well-practised memories hold up.

Be careful about how far this goes. Both studies used small experiments with memory tasks, not a full exam. The 2026 study found stress did not impair recall for any of its groups, so it does not show that practice was the cause. A fair reading is that practice by recall is a sensible bet for a stressful day, not a guarantee. The wider case for testing yourself is in retrieval practice: why testing yourself beats rereading.

What to do with this before an exam

Nothing here proves a method for exam stress, so keep the advice small and honest.

• Practise recalling, not rereading. Answers you have pulled out of memory several times are the ones the studies suggest are harder to disturb.
• Do not cram the last night. Nothing in these studies tested it, but a late panic session is the kind of stress that lands just before recall. See does cramming work for exams.
• Rehearse the situation. Do one practice quiz with a timer and no notes, so the format feels familiar.
• Skip questions that stall you and return. This is common exam advice, not a finding from these studies.
• Get help if the anxiety is severe. If worry stops you studying or sleeping, talk to a school counsellor or a doctor. That is a health matter, not a study trick.

A worked week of practice quizzes with Study Shot

Here is how to build the "recall before the exam" habit with Study Shot, which turns a photo of a page into a practice quiz. Say the exam is on Friday.

Monday: find the gaps

1. Open Study Shot in your browser and choose Make a new quiz.
2. Photograph one page of your textbook or notes. Hold the page flat and fill the frame.
3. Pick 10 questions and the Tiered level, which climbs from basic to advanced, then press Create questions. It can take up to a minute.
4. Answer one question at a time. Pick an option, press Check answer, and read the explanation, especially for the ones you miss.

At the end, the results screen shows a score for each level and a Look at these again list of the questions you missed, with your answer and the right answer. That list is your plan for Tuesday.

Wednesday and Thursday: retake, timed, without the page

Use Retake quiz on the same quiz and set a timer on your phone. Do not look at the page. Your quiz stays in your library with its best score, so you can see whether you are improving. For a harder pass, make a new quiz from the same photo at the Advanced level, which asks you to apply and predict in new situations.

Thursday night: light review, then sleep

Look through the questions you missed once more, then stop. The aim is to walk in knowing you have already pulled this material out of memory several times.

Two honest cautions. The questions are written by an AI model and can contain mistakes, so use the explanation to check against your textbook, and use Report a problem with this question if something looks wrong. Also, Study Shot makes multiple-choice questions only, and many exams ask for written answers or worked problems. Pair the quiz with blank-page recall on paper. A multiple-choice quiz tests recognition more than recall, and the lab studies above used recall tests.

Frequently asked questions

Does stress before an exam affect your memory?

It can. A 2017 meta-analysis found memory was worse when stress came just before or during recall, and also when it came before or during learning. Stress just after learning tended to help.

Why do I forget everything during an exam?

Research points to trouble getting information out, not losing it. Cortisol given before recall lowered memory in a 2005 meta-analysis of 16 studies.

Is a little stress good for studying?

The studies here do not measure "a little" stress, so they cannot say. They show the effect depends on timing, and that stress before or during learning tended to lower memory.

Can practice tests protect against exam stress?

One study found they did, and a 2026 study found stress did not hurt recall of practised items either. Both were small experiments, so treat practice as a sensible bet, not a guarantee.

Get started with Study Shot

Try Study Shot: it is free to start. Photograph the page you are studying tonight and get 10 practice questions on it, from basic to advanced.