Scoring Rubric: https://satonlinecourse.collegeboard..._2011-2012.pdf
Your profile says that you are from Egypt. Can you speak English well?
A good SAT breakdown score would be:
Math: about 650
CR: about 550
Writing: about 570
Do lots of math problems.
Search AMC Problems on Google. You should see AMC 8: let me know if you can't find it.
Practice with the AMC 8 tests and review by looking at the solutions.
Do it under time limit.
PM me for more info on math if you still have trouble.
Memorize some vocabulary. Do this by looking over the CR sections on an SAT test and writing down the vocabulary.
There's advice in this forum. "How to attack the Critical Reading section effectively" or something like that.
STUDY GRAMMAR. So important.
Practice writing essays and get a good english teacher to grade it for you if possible.
If you wanna do well, YOU HAVE TO PUT IN EFFORT>