How/where to study to get my grade up from a 32 to a 36?

I’m serious about getting the best possible score I can. I have the official “real ACT” book and I plan to go through it.
Here’s my score breakdown:
Composite: 32
English: 33 (Usage/Mechanics 17, Rhetorical Skills 16)
Math: 29 (Pre-Alg/Elem.Alg 17, Alg/Coord.Geo 15, PlaneGeo/Trig 13)
Reading: 34 (Social Studies 17, Arts 18)
Science: 33
Writing: 7 (I need help here, and on the SAT writing. I don’t know what I’m doing wrong.)

This is my first time score, and I will take the test again in June. Any help is appreciated! I think I really need the most help in the math and writing sections.

I mostly just took tons and tons of practice tests, because then I was really familiar with the format when I went in for the actual test.

I also used Learnerator for the content, but you have to pay for that, I think. I got it free through my school district, so maybe ask your teachers about that?