what are some useful tips that you use to study more effectively?

I am gonna be having a lot of exams these next few weeks<br>for a lot of different subjects and I feel extremely stressed out.<br>I am having a lot of difficulty getting myself started studying, I have a hard time focussing<br>and use a lot of time getting started so I will only have a few hours left to use.<br>Is there any thing you guys can tell me that will help me study in a better way<br>and get the most of the time that I have . I am going to use a lot of time studying anyway so I want to make the most of it.