Does taking a SAT course help with my chances of getting a higher score?

Hello!
I’m currently considering enrolling in a SAT course for math and literature to increase my chances. I’m currently a sophomore with a gpa of 3.5 (4.4 on a scale of 5.0) I want to go to college in The US however, I don’t feel my school is providing me with the material needed to receive a high score in the SAT. A private college is offering preparation courses and they’re quite expensive, I want to know if these classes truly help or are they jusst a waste of time? Has anyone had experience with them? (I will be taking the classes at FSU, they opened a branch here)