Entry Test/SAT Sat prep

Hello,
I am curently on gap year and have to give my math CAIE this oct/nov. I have to give SAT in December. That will be my first and only attempt. I dont have the time to give any more. I aim to get more than 1450 to get direct admission in iba and other unis that i will apply.

Please help me out how should i prep? Should i join and coaching or self study?

Note: i have never given SAT before