The forgetting curve is your enemy. Spaced repetition is how you beat it.
What Is Spaced Repetition?
Spaced repetition shows you a word just before you are about to forget it. Each successful recall increases the review interval — so you spend time on words you don't know, not words you already do.
The Best Tools
Anki is the gold standard — free and customisable. Clozemaster is excellent for learning words in context. For TEF/DELF prep, ask your tutor for a curated deck of exam-frequency vocabulary.
