Yes, everyone can study for it, but generally the easiest ways to boost your SAT scores are to pay a tutor to drill you through the parts that can have the biggest impact on your scores, and to take the test multiple times until you get a score you like, both of which can get very expensive. Retaking the test is really helpful, as you'll be more familiar with the format and less stressed out the second time around, but a lot of students don't have the opportunity to take it more than once.