What books are you going to use? I took the Math level 1 test last October, and although the curve is meh you can get a high score. I used Barron's, and it's not bad in my opinion, even though I found the practice tests in there a bit harder than the real thing.
I would recommend you get the official books too, as real practice tests, especially for math, are invaluable. The big blue book has one practice test, while the other one has two IC and two IIC tests.
Finally, math is more about practice than studying. You can try solving questions on the internet, such as Sparknotes practice tests. There's also the official SATII
booklet, be sure you do questions in there.
Good luck!