There are a lot of misconceptions about what good revision looks like. In fact, there has been a lot of psychological research into the field of revision, which has found that most people revise by re-reading their textbooks and making summary notes. Whilst these strategies do work, they are regarded as relatively inefficient ways of revising - meaning it will take a lot longer to memorise the material than other revision techniques. 

Research has found that the most effective revision technique is Practice Recall. Practice Recall is where you practice recalling the material you need to remember, the more you do this the better you will be at recalling the material in the exam. Revision should really be as much self testing as possible, with little or no reliance on reading though notes. Notes should only be used to check you recalled correctly.