I have been getting a 580-600 on sat pratice tests, is it possible I can raise that score by 200 points in 8 months?
like overall total??? and yes anything is possible if you just keep practicing 
Depends on the section. Improving the math score is much easier than improving your EBRW score. But 8 months is a very long time. No doubt that you can do it regardless of the section. Make sure you put in the time and effort…8 months seems like a long time until school and other commitments get in the way.
Best of luck.