How to study for exams: an evidence-based plan from 8 weeks out to exam day

How to study for exams: the short version

If you want to know how to study for exams in a way that research supports, three principles cover most of it:

1. Test yourself instead of rereading. Retrieval practice often produces large gains in long-term retention compared with restudying (Roediger & Butler, 2011).
2. Spread your study out. The best gap between sessions grows with the time until your exam (Cepeda et al., 2006), and spacing beats cramming in real classrooms too, d = 0.54, a moderate effect (Mawson et al., 2025).
3. Mix topics once you know them. Interleaving similar, easily confused topics has a moderate overall benefit, g = 0.42 (Brunmair & Richter, 2019).

The same applies whether you are learning how to study for a test at school or how to prepare for a certification exam at work. The difference with certifications is that you usually study alone, alongside a job, for one high-stakes attempt. That makes a written plan more important. This page gives you one, from eight weeks out to exam day.

Before you start: what not to do

• Do not plan to cram. Massed study can look fine on a test the same evening and leaves little behind days later. In Roediger & Karpicke, 2006, restudying beat testing at 5 minutes but lost after 2 days and 1 week.
• Do not trust the feeling of knowing. Students who reread become more confident without remembering more (Seban et al., 2024). Most students still study mainly by rereading (Karpicke et al., 2009).
• Do not choose methods by learning style. There is virtually no evidence that matching study to a visual or auditory "style" helps (Pashler et al., 2008).
• Do not trade sleep for study hours. Restricting sleep to 3 to 6.5 hours, compared with 7 to 11, impairs memory formation (g = 0.29), and missing some sleep has similar consequences for memory to missing a whole night (Crowley et al., 2024).

The 8-week exam prep process

This process assumes about 8 to 10 hours of study per week and a multiple-choice certification exam. It is our application of the research cited on this page, not a programme tested in a trial. Compress or stretch it to your timeline; the order of steps matters more than the exact weeks.

Week 8 before the exam: map and baseline

• Download the official exam objectives from the issuer. This is your checklist.
• Take a free practice test cold, for example our Security+ practice test. Record your score per domain.
• Book your exam date if you can. A fixed date makes spacing possible to plan.

Weeks 7 to 4: learn and retrieve

• Cover new objectives in order of exam weight and weakness.
• Open every session with 10 to 15 questions on material from 3 to 7 days ago. Close every session by writing what you remember on a blank page.
• Keep an error log: every missed question, with one line on why the right answer is right.
• From week 6, add two interleaved sets per week of 20 questions mixing topics you tend to confuse.

Weeks 3 and 2: mixed practice and mocks

• New material should be finished by the start of week 3.
• Take a full-length, timed practice exam at the start of each week. Review every question, right or wrong.
• Spend most remaining sessions on the two weakest domains, always through questions, not rereading.

Final week: consolidate

• Daily mixed sets of 20 to 30 questions. Work through your error log twice.
• A last full mock no later than three days before the exam.
• Keep sleep regular. The night before: a short review at most, then rest.

Exam day

• A light 15-minute look at your error log, no new material.
• Arrive early or set up your online proctoring space in advance.
• Mark hard questions and move on; come back at the end. More on technique in how to pass an exam.

How to structure a single study session

A 90-minute session that follows the evidence:

1. Phone in another room. An early study found the mere presence of your own phone reduced available cognitive capacity (Ward et al., 2017). A later meta-analysis found the effect is smaller than first reported, significant only for working memory capacity and modest even there (Parry, 2023). It costs nothing to move it. More in how to focus while studying.
2. 15 minutes: review questions on older material.
3. 45 minutes: new material, in two blocks. After each block, close it and recall.
4. Short rest. Brief periods of quiet rest after learning facilitate consolidation of new memories (Wamsley, 2019).
5. 20 minutes: questions on today's topic and an update to your error log.
6. 5 minutes: plan the next session's reviews.

When your practice scores stop improving

Most candidates hit a plateau around the middle of their preparation. Before adding hours, diagnose the type of error from your error log:

• "I didn't know it." A knowledge gap. Add the topic to your spaced reviews and write flashcards for the facts involved.
• "I knew it but mixed it up with something similar." A discrimination problem. This is where interleaving helps: mixed sets of the confusable topics, plus a comparison table.
• "I knew the facts but chose the wrong action." An application problem, common in PMP and CISSP scenario questions. Explain each answer to yourself, including why each wrong option is wrong. Techniques such as elaborative interrogation and the Feynman technique fit here.
• "I misread the question." A reading or pacing problem. Practise timed sets and underline the key constraint in each stem (first, best, most likely, least).

Also check whether you are recognising questions rather than solving them. If your score on questions you have seen before is far above your score on fresh ones, the higher number is memory of the question, not of the topic. Judging your own learning accurately is a skill in itself; see metacognition.

How long should you study for an exam?

No study can tell you how many hours a particular certification needs; that depends on your background and the exam. What the research does say is that the same hours work better spread out than packed together. The optimal gap is about 20 to 40% of the time until a test a week away, falling to about 5 to 10% for a test a year away (Cepeda et al., 2008). Practically, a longer, lighter plan beats a short, intense one with the same total time.

For exam-specific estimates, see our study guides, such as the CCNA study guide or the PMP study guide, and build your calendar with the study schedule template.

If you are anxious about the exam

Test anxiety is common and treatable. A meta-analysis of 44 randomised trials found interventions reduced test anxiety (g = -0.76) and improved performance (g = 0.37), with behaviour therapy best supported and study-skills training among the promising approaches (Huntley et al., 2019). Five-minute tricks on the day did not help in a trial with 300 students (Ganley et al., 2021). If anxiety is severe, get professional help early. More in test anxiety.

How to use this for a certification exam

The 8-week process above, as a checklist with numbers:

1. Week 8: official objectives downloaded; baseline on our free practice test for your exam (Security+, AWS, PMP or others); exam booked.
2. Weeks 7 to 4: about 75 to 100 practice questions per week, spread over 5 sessions. Every topic reviewed after about a week and again two to three weeks later.
3. Weeks 6 to 4: two interleaved sets of 20 questions per week.
4. Weeks 3 and 2: one full-length timed mock per week, reviewed in full. Retake our free practice test and compare domain scores with week 8.
5. Week 1: daily mixed sets of 20 to 30 questions; error log twice; final mock at least 3 days before the exam; 7+ hours in bed every night.
6. Exam day: 15 minutes on the error log, then go.

For the science behind each step, start with how to study effectively.