Act test??

well i havent been to school for almost three months and iwas in my senior year..im kind of like a above average studentand im really go0d at math and the college i wanna go (shasta college, redding, ca) told me i can get in with just my act score and i reallyy need some guides or books that are really going to help me because i only have about 2 months for the act test and im gonna be studying kinda by myself