Concentration (or the lack of it)

As you probably already've guessed, I have a test tomorrow and I have to study, so I'm blogging. Logic, not? I just can't concentrate, as always. Does anyone of you have some tips to concentrate better? I mean, I know I should have my computer on, but I need it. The problem with this subject is there is no practice-test or anything like that. The only thing you can do is summarize and summarize again, and read that about twenty times. But when I've read it twice, it gets B O R I N G...

So, what do you do when you have a subject like this? Go on, do something else, or whatever?

I think I'll start and read again...

xx Raevyn