Your Memory Right Now
Your memory score is the estimated chance you’d remember a card you’ve started if you were quizzed on it right now. How it’s calculated.
Memory by unit
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How Smart Review Works
Every card in your deck has its own schedule. A new card comes back later in the same session (about 10 minutes later, or within a minute if you missed it), then the next day. Each time you remember it, the gap before you see it again gets longer: about 3 days, then about a week, then a few weeks. When you forget a card, it comes back in 10 minutes and its gap shrinks, so you see it more often.
That means the cards you know well stop eating up your study time, and the ones you struggle with keep coming back until they stick.
What the buttons mean
| Button | Use it when | What happens next |
|---|---|---|
| Forgot | You didn’t remember it, or you got the question wrong. | It comes back within 10 minutes, and its gap shrinks. |
| Hard | You remembered it with real effort, or you guessed a question right. | The gap grows a little. |
| Good | You remembered it after a moment’s thought. | The gap grows, usually to 2 to 3 times as long. |
| Easy | You knew it instantly. | The gap grows the most, so easy cards show up less often. |
For practice questions, a wrong answer counts as Forgot automatically. If you get it right, you tell Smart Review whether you guessed (Hard), knew it (Good), or found it too easy (Easy). Every button shows when the card is scheduled to come back, and you can undo a misclick. On a keyboard, press Space to show the answer and 1 to 4 to pick.
What the memory score means
Smart Review estimates the chance you’d remember each card if you saw it right now. On the day a card is due, that estimate is about 90%, and it keeps sliding the longer you wait. Cards you’re still learning, or relearning after a miss, count as 60% at most. A unit’s memory score is the average across the cards you’ve started in that unit. A card counts as mastered once its gap reaches three weeks.
Built around exam day
Gaps never go past 60 days. Before the AP exam on Tuesday, May 4, 2027, any card whose next review would land after May 2 is pulled into a final review week from April 27 to May 2, spread across those days, so every card you’ve started comes back at least once in the last week if you keep up with your reviews. Plan a little extra time that week: with the whole deck started, expect about 30 minutes a day.
Why Spaced Repetition Works
In the 1880s, the psychologist Hermann Ebbinghaus tested how quickly he forgot lists of nonsense syllables he had memorized. Memory faded fast at first and then more slowly, a pattern now called the forgetting curve. Each time you review something, you forget it more slowly afterward.
Two of the most reliable findings in learning research build on that. The spacing effect: studying in short sessions spread over days beats cramming the same amount of time into one night. Retrieval practice: pulling an answer out of your memory strengthens it more than rereading your notes. Smart Review does both. Every card makes you pull the answer from memory, or pick it from the choices, before you see it, and the schedule spaces your reviews for you.
Questions You Miss Elsewhere Come Here Too
You don’t have to add cards yourself. When you miss a question on any of these, Smart Review adds it to your review the next time you open this page on the same device:
- The Question of the Day, on its own page or the homepage
- The unit practice question pages, with all 300 questions by unit
- The practice question bank in “Review: quick concept questions” mode
- The vocabulary flashcards, when you tap “Missed it” in Learn mode
How Much to Study Each Day
A short session every day works better than a long one once a week. With 10 new cards a day, expect about 20 minutes a day while you’re adding new cards, and less once you’ve seen them all. Pick 5 new cards a day to keep it closer to 10 minutes. With the default deck (Units 1 to 4, 541 cards) and 10 new cards a day, you’ll have seen every card in about 8 weeks.
If you skip a few days, your due cards wait for you. Do your reviews first, and lower your new cards per day until you’ve caught up.
Smart Review’s practice questions are Review level: one concept at a time, for building recall. The AP exam asks longer questions about business and personal finance cases. When you’re ready for that, take the full-length practice exam.
Save or Move Your Progress
Smart Review saves your cards and schedule in this browser on this device, with no account. That means school computers that clear data when you sign out can erase it, and it won’t follow you from a Chromebook to your phone. A backup file fixes both: download one here, then load it on the other device.
Like the rest of the site, this page uses Google Analytics, which receives general usage totals such as how many cards were answered in a session. See our privacy policy.
Frequently Asked Questions
What is spaced repetition?
Spaced repetition is a study method where you review material at growing intervals, timed for right before you'd forget it. Cards you know well come back less often, and cards you miss come back sooner.
How is Smart Review different from the vocabulary flashcards?
The flashcards page is for flipping through terms or drilling them in one sitting. Smart Review plans your studying across days and weeks: it remembers every card you've studied and decides which ones you need today. It also includes the 300 practice questions.
How long should I study each day?
Expect about 20 minutes a day with 10 new cards a day, or about 10 minutes with 5, while you're still adding new cards. It drops once you've seen every card. The last week before the exam is busier, at about 30 minutes a day.
What happens if I miss a few days?
Nothing is lost. Cards that came due wait for you. Do your reviews first and add fewer new cards until you catch up. If you still remember a card after a long gap, Smart Review gives it an even longer gap next time.
Does my progress save?
Yes, in this browser on this device. To move it to another device or keep a copy, download a backup and load it on the other device.
Are these questions as hard as the AP exam?
No. They're Review level: one concept at a time, for building recall. The AP exam uses longer case-based question sets. For that, take the full-length practice exam.