Flashcards are one of the most effective ways to remember facts, definitions, vocabulary and formulas, but only if you use them the right way. Two ideas from learning research make the difference: active recall and spaced repetition.
Active recall: test yourself, don't reread
Rereading notes feels productive, but it mostly makes material feel familiar. Trying to remember the answer before you look at it, even if you get it wrong, strengthens your memory much more. That's what a flashcard forces you to do: you see the question, you try to answer, then you check.
Say the answer out loud or write it down before flipping the card. Being honest with yourself is what makes it work.
Spaced repetition: review just before you forget
We forget new information quickly unless we review it, but each review makes the memory last longer. So it's most efficient to review cards you find hard often, and cards you know well only occasionally.
The Leitner system, invented by Sebastian Leitner in the 1970s, does this with boxes. Every card starts in box 1. When you know a card, it moves up a box; when you don't, it goes back to box 1. You review box 1 most often and the last box least often, so your time goes to what you haven't learned yet.
The “Learn” mode of the flashcard maker works exactly like this, and shows how many cards are in each box.
How to make good cards
- One idea per card. “Mitochondria: makes energy (ATP) for the cell” is better than a paragraph about cells.
- Use your own words. Writing the card is part of learning it.
- Ask both ways for vocabulary. English → Sinhala and Sinhala → English are different skills.
- Add an example. For a formula, include a tiny worked example; for a word, a short sentence.
- Break up lists. Instead of “the 7 functions of…”, make a card for each one.
A simple routine
- Make cards right after a lesson or chapter, while it's fresh.
- Study for 10 to 15 minutes a day rather than for hours once a week.
- Start with Learn mode, and use Quiz mode before a test to check yourself under pressure.
- Keep old decks: a quick review a few weeks later keeps the knowledge for the exam.
Save time making decks
You don't have to type cards one by one. Paste a list with one card per line, such as “photosynthesis - how plants make food from sunlight”, and every line becomes a card. You can also share a deck with classmates as a link, or print the cards double-sided.