What is the best SAT math book for basic level math

Hey! I’ve taken a few SAT practice tests and I always get a bad score in math. I’m quite sure that this is because I don’t know the concepts needed to solve math problems, and since math is the most ‘‘learnable’’ section, I am certain that with hard work I will improve a lot. So, my math score is usually 400, sometimes even lower.

What book do you think is the most comprehensive for basic level math? I’m aiming for at least 650, preferably 700+, but I need to know the basics first.

Can someone make a suggestion please?

Don’t even get a book, go to Khan Academy and start from Pre-Algebra.

I guarantee you will be a lot better after completing Trig from their website. If it doesn’t, get Barrons.

By the way, I am a horrible person, so my advise should be considered lower-priority as I finished my complete Barrons book the day before the exam…