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first, avoid distractions so you don't procrastinate :D
you can revise by visual, hearing or kinaesthetic (movement) methods;
create flashcard (questions on one side, answers on the other)
Acronyms
Rhymes, poems, lyrics or songs that help you remember facts
make a mind map
asking a teacher or tutor for help if you're stuck
use colours that help your brain match and remember information
getting someone to test you
past papers
write on post-its and stick them around the house so you can memorize them.
I hope these are useful to you :)