How to Get a 1200+ in 3 weeks?

So I took the SAT March 9th, and I take it again at my school in 3 weeks. What do you all recommend I do to try to get either a 1200 or 1250+? I’ve been studying on the things I lack for the Reading and Writing, but how do I go about studying for the math section? That’s my weakest, so I want to improve by 100 points if possible.

I’ve already decided im gonna take the test again on June, but I want to start off on a better basis so I can eventually get a 1350+ (really a 1450+ if im being delusional.)

I appreciate all tips!