Study, study and study some more. Most students study for an hour or so before feeling they have done enough. This sense of convincing oneself that they have done enough is the worst enemy a student can make for him or herself. Instead of setting time limits on study sessions, focus more on content. Set realistic targets involving various chapters or tests. Set targets such as ‘today I will complete chapter one and two’, ‘tomorrow chapter three and four’ and so on. This will allow you to be more flexible and not feel pressed for time.
The second technique is to revise. What many people do not know is that learning everything the first time is not enough to retain it. Revising it regularly will help you to retain everything that you have studied. Every week or so, make sure you review all that you have studied. This does not involve learning everything all over again but rather reading through any notes you have made.
In the case of mathematics, practice is essential, as relying on theory is never enough. Practice tests as often as possible and keep one hour a day just for the number crunching subjects. As for theory, make brief notes, no longer than a line to help in the revision process.