Study weeks ahead before the test. Remove all electronics from your study area. That includes computers, TVs, cellphones, and Ipods. If you can't read then write. If a textbook seems dull and boring I can show you my secret study tactic. Get yourself a blank notebook, read each paragraph carefully, and summarize what you read in one or two sentences making sure to include key words. Soon enough, you'll have a more simpler textbook that you can study from because it's your own summary.
Dude, if you can't get anything that you've read, do tonnes of exercises. You'll know your weakness in certain aspects from there as long as you have a GOOD reference book by your side. Jot mini-nots and bring them wherever you go. When you have time, read them but make sure you understand all the things you've jotted. Good luck ! :DD