Spaced repetition schedule: when to review so it sticks until the exam

The forgetting curve in plain words, review intervals that work as a rule of thumb, and a worked example: four chapters, one final on December 10.

Updated October 18, 2026 · 8 min read

A spaced repetition schedule means reviewing material several times at growing intervals instead of in one long session: a common rule of thumb is 1, 3, 7 and 14 days after you first learn a topic, then about a month later, with a final review the day before the exam. Each review should be active — answer questions from memory, don't just reread. Because forgetting is fastest right after learning, the first reviews come quickly and the later ones farther apart.

Below: what the forgetting curve actually says, which intervals make sense for midterms and finals, a step-by-step method for building reviews into your exam plan, and a worked calendar with real dates.

What is the forgetting curve?

The forgetting curve shows how fast newly learned material fades when you don't come back to it. In 1885 the German psychologist Hermann Ebbinghaus learned lists of nonsense syllables, then measured how much effort it took to relearn them after hours, days and weeks. The pattern he found has held up ever since: forgetting is steepest in the first hours and days, then slows down.

The useful part is what happens when you review. Each time you pull the material back, the curve starts again from the top — and it falls more slowly than before. That is why the gaps between reviews can grow: after the third or fourth review, a topic survives a week or two without help, while after the first lecture it may not survive the weekend.

Two honest caveats. The curve depends on the material (meaningful ideas stick better than nonsense syllables) and on you (sleep, prior knowledge, how well you understood it the first time). So treat any specific interval as a starting point, not a law.

Why does spaced repetition beat cramming?

Spaced repetition beats cramming because the same number of hours, split into several sessions with breaks between them, leaves more in memory on exam day. This is the spacing effect, one of the most replicated findings in learning research. Cramming does work for a quiz tomorrow morning — but the material is gone soon after, which hurts on cumulative finals and in the next course that builds on it.

The second ingredient is retrieval practice, also called the testing effect: trying to recall an answer strengthens memory more than reading it again. Rereading feels productive because the text looks familiar, but recognizing something is not the same as being able to produce it in an exam. A spaced review is therefore not “read chapter 3 again” — it is “close the book and explain chapter 3”.

Where researchers disagree is the ideal gap. A general finding is that the further away the test is, the longer the gaps can be. For a final four weeks away, reviews every few days and then weekly are reasonable; for an exam in a week, you compress everything.

Which review intervals should you use?

Use expanding intervals counted from the day you first studied a topic. These numbers are a rule of thumb that works for most college courses — shift any review by a day when life gets in the way.

Two adjustments. If a review goes badly — you can't recall most of it — make the next gap shorter instead of longer. If a chapter is easy, you can skip a review. And when a review would land on or after exam day, drop it: the final review covers it.

How to build spaced repetition into an exam plan

You build spaced repetition into an exam plan by working backward from the exam date and reserving a short review slot every day. Here is the method step by step.

1. List the topics and the exam date. Chapters, lecture weeks or problem sets — whatever unit your course uses. Write down the date of each midterm or final.
2. Count the study hours. Estimate how many hours each course needs before the exam; the study hours calculator turns credits into hours per day.
3. Block the day before each exam for review. No new material on that day. If two exams are back to back, the review for the second one moves to the day after the first.
4. Finish new material early. The last new chapter should be studied at least a week before the exam, so it still gets two or three reviews.
5. Reserve 20–30 minutes a day for reviews. Reviews pile up — by week three you will be reviewing three or four chapters at once. Take this time out of your daily study hours before you plan new material.
6. Write the review dates down when you learn a topic. Study chapter 4 on Monday? Put +1, +3, +7 and +14 into your calendar, planner or flashcard tool right away.
7. Make every review a test. Questions, blank-page recall, practice problems. If you only reread, you are not using spacing — you are just reading more often.

For the bigger picture of how the weeks before finals fit together, see the final exam study plan.

Worked example: four chapters before a December 10 final

Say your Biology final is on Thursday, December 10, 2026. You study one new chapter every Monday starting November 2, and follow the 1-3-7-14-30 rule. The final review goes on Wednesday, December 9.

Three things the table shows that you would miss in your head:

• Mondays get crowded. On November 16 you learn chapter 3, review chapter 2 (+7) and chapter 1 (+14). On November 23 it happens again, and on November 30 you still have two reviews at once. Plan a shorter new-material session on Mondays, or move the +7 review to Sunday.
• Holidays shift reviews, and that's fine. Chapter 4's +3 review falls on Thanksgiving, so it moves to Friday. A day earlier or later makes no real difference.
• The last chapter gets fewer reviews. Chapter 4 still gets four touches before the final, but if you studied it on December 7, it would get only two: the next day and the final review. That is why new material should end at least a week before the exam.

Time cost: four chapters × four or five reviews × about 15 minutes is roughly four to five hours over five weeks, plus the final review. That is small compared to the study hours themselves — but only if it is in the plan from the start.

What should a spaced review session look like?

A good review session is short and active: you try to produce the answers first and check them second. Options that work for most subjects:

• Blank-page recall. Write everything you remember about the chapter, then compare with your notes and mark the gaps.
• Practice questions. End-of-chapter questions, old midterms, problem sets you solved before — solved again without looking.
• Flashcards. Good for definitions, formulas, dates and vocabulary. Paper cards in a box work as well as any app; the classic Leitner method moves a card to a less frequent pile each time you get it right.
• Explain it out loud. Teach the chapter to an imaginary classmate in five minutes. Where you stall is what you need to review.

Planner and flashcard tool: who does what

A planner and a flashcard tool solve different problems, and they work well together. A flashcard tool tracks each individual card and decides when it comes back. A planner answers the bigger question: how many hours you need per course, what to study on which day, and whether it all fits before the exam.

Sprout Study is the planner side. It splits each course into tasks by section — reading, notes and a self-test — in sessions of 30 to 120 minutes, spreads them over the days until each exam and puts a review session on the day before every exam. It does not schedule card-by-card reviews. The practical setup: set your daily study hours in the planner 20–30 minutes below what you actually have, and use that remaining time for the reviews from your flashcard tool or your paper list. If you miss a day, unfinished tasks move to today and the rest is re-spread over the remaining days, while the exam date stays where it is. The same backward-planning logic is explained in how to make a study schedule.

Common spaced repetition mistakes

• Rereading instead of recalling. Familiar text feels like knowledge. Test yourself first.
• Starting reviews too late. If the first review is a week after the lecture, most of the work is relearning. The +1 review is the one that saves the most time.
• No time budget for reviews. A plan full of new chapters leaves no room, and reviews are the first thing dropped.
• Treating the intervals as sacred. Moving a review by a day is harmless. Skipping all of them is not.
• New material the day before the exam. That day belongs to the final review and an early night.

Questions and answers

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• How to make a final exam study schedule that works backward from your exam dates

  How to study for finals: count the hours for each exam, plan backward from every exam date and spread the work so finals week is review, not cramming.

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