Writing notes, rewriting them shorter, saying them out loud to yourself, and rewriting again in another format eg mindmap. Reread as much as possible. I found this would cement info in my mind and I'd look through the notes so often that in the exams I'd often be able to picture my notes exactly as they were. But as someone mentioned earlier work out if you are mainly visual, audio or kinesthetic, there's quizzes online you can do to find this out. Some people learn well by listening but I just tune out as I'm not an audio person at all, never listened during story time at school and cannot get on with audiobooks! I'll read it myself thanks!