The best way to approach revision is to start early!
Have a revision plan and stick to it. If you revisit content little and often, you'd be amazed how quickly it sticks in your brain.
An effective way to take notes is by using the 'Cornell' method. Please watch the video above to learn about how to do this.
You could do this at home as a way to revisit your notes and condense the information.
Everyone revises differently, some use mind maps, flashcards, essay-writing. Some use videos, songs and rhymes. No matter which type of learner you are, there is a way of revising which will suit your learning style.
See The Learning Scientists Website for ideas and information about different ways to revise and study.
They have lots of downloadable materials and videos for you to use.