Any tips for revision that actually workWatch
You need to use the information you have, to assess what you can remember/understand and what you don't. Pick a topic, any topic. Take a sheet of paper and write down a summary of what you know about it - as if you were going to teach a fellow classmate about it. Take your time doing this - try your hardest. Then compare it to your notes - how accurate is it? What's missing/misunderstood?
Once you find the gaps in your knowledge, you can set about plugging them.