Short answer: re-reading feels productive and forgets fast. Spaced repetition works because it reviews each fact just before you would have forgotten it. The simple version students actually stick to is the 1-4-7 rule: review after 1 day, then 4 days, then 7 days. That schedule is how toppers keep thousands of facts alive till exam day.
Why re-reading fails
Re-reading makes a page feel familiar, and familiarity feels like knowledge. It is not. When you re-read, your brain recognizes the material instead of retrieving it, and recognition is a much weaker memory than retrieval. That is why students walk out of the library confident and blank out in the exam hall. The exam asks you to retrieve. Only retrieval practice trains retrieval.
Flashcards force retrieval. You see a question, you try to answer before flipping, and the effort of trying is what builds the memory. A card you get wrong teaches more than a page you re-read, because the mistake marks exactly what needs another review.
The 1-4-7 rule in practice
Day zero: learn the topic properly, from class or your notes. Day one: review its cards. You will remember most of it, and the few you miss go back in the pile. Day four: review again. This is the review that matters most, because day four is when the forgetting curve bites. Day seven: review once more. After that, weekly, then monthly reviews keep it alive.
The mistake is adding too many new cards at once. Cap new cards at 20 to 30 a day. Reviews from old cards pile up on their own, and a daily review load past 100 cards is where students quit. Slow and steady is not a slogan here. It is the load limit that keeps the system running for months.
Make cards that work
One fact per card, phrased as a question. Good card: what nerve is damaged in Erb's palsy? Bad card: a paragraph about the brachial plexus. If a card has two facts on it, split it. If a card is a sentence you just recognize, rewrite it as a question you must answer. Cards that test understanding beat cards that test recognition: why does this drug cause a cough beats what is the side effect of enalapril, because the first one forces the mechanism.
Let an app handle the schedule
Tracking a thousand cards by hand across months is a job nobody keeps up. Ominsol's flashcards handle the scheduling for you, so you just do the daily reviews and the app decides what comes back when. Pair it with our guide to MBBS notes you actually revise, which shows how to turn notes into cards, and try the method on a real topic: our NEET PG medicine topics and our brachial plexus guide are both built to be turned into cards.