How do I best prepare for the ACT in three months?

<p>Hear me out, I just took the June SAT and think I did not do so well; Univ. of Michigan CoE is my dream school and with a perfect GPA it is pivotal I do well on one standardized test to substantiate my school grades in order to better my chances of admission. I took the ACT for the first time with no preparation and got a 28 (33 E, 30 M, 24 R, 26 S, 7 W). I desperately want to get a 32+ with a 33+ in math, so what materials and such should I use to prep over the summer?</p>