Should I start SAT Classes or study on my own?

Right now I’m a sophomore in high school and recently took a practice SAT test(not PSAT, more like a placement test) at a tutoring center nearby. This was the first SAT Test that I have ever taken and I didnt study for it at all. I got a 1080/1600. i got a 600/800 on the english and 480/800 on the math section. I just need advice on whether i should take SAT classes or buy a practice book study on my own? Will the classes be worth the money, or will I be fine doing continuous self-practicing(starting now) ?? Thanks!

@artist03 As I tutor for Math, I would suggest having your concepts strong. What topics did you face more difficulty with?