ACT math and english

My composite score on my first ACT was a 32. I achieved this with one day of studying, but I, ideally, want to improve my score to a 34. I received:
Reading-36
Science-34
English-30
Math-29

What should I do to improve my math and English scores? Math is actually one of my best subjects, but for some reason I found the math section harder than other practice tests that I had taken (I got a 34 on one math practice test). I have the Red book and the ACT blackbook. What resources should I use to improve my math and English scores? Also, I received a low score on the essay. Does anyone know of any way that I can improve my writing?