when i try to study for a test i read the book but i forget the stuff how can i study for tests in order to passs

Everyone studies differently. This may not be a very useful suggestion depending on how/why you can't retain knowledge, but do try to study in stages. If you know a test is coming up in 2 weeks, study 20 minutes-30 minutes each day and at the beginning of each study session, take 5 minutes to try and recollect what you studied on the previous day(s). What you should avoid is studying in one big chunk right before the test. You may have short-term memory loss, long term memory loss, or you may just have a problem remembering things that don't interest you. In any case, whould the problem persist, try and involve a doctor. Simple things like good sleep, fresh air, good diet and a bit of exercise can go a HELL of a long way to help your memory and many other brain functions (not to mention you'll actually be healthier ).

take a rbreak from the computer works for me.

There are loads and loads of ways to improve your studying practice. If you find you have trouble concentrating, try something like;

(10+2)*5;
-10 minutes of work, solid;
-2 minute break from whatever you were doing, don't even look at your work!;
-*5 times in 1 hour.

That makes up 60 minutes, and you'll find that you get more work done in that 60 minutes than you would without taking 5*2 minute breaks.

Worth a shot, I know it helps me when I'm working!

Hey man one way that helps me is to do some sort of excersise to get the blood flowing before i read or study helps you think and focus better

Pride and Prejudice is a fantastic book you must read it