You don't want to make a caeer of taking the SAT! Now try to focus on getting the best grades of your life. Your transcript and the rigor of the courses that you took are the first thing and Admissions officer will look at when reviewing your application!
There's no official number of times that you should take the SAT, though you're usually prevented from taking it more than 10 times. The catch is, all colleges will see how many times you took the test. So, if you have three really low scores and one really high score, the school will be able to tell that you worked hard to improve your score (or they might think you just got lucky). However, there is no evidence that taking the SAT more times will increase your score. If you're extremely worried about your SAT score, try another test like the SAT II or the ACT. Often, students who test poorly on the SAT test incredibly well on the ACT. Don't get too hung up on your "goal score." Remember that the SAT is just one (relatively small) part of your college applications! Good luck with whatever path you choose