How to improve my ACT score?

So I took the ACT for the first time without any prep and I got a composite score of 27. I really want to raise this to at least a 29 or 30. I know that I definitely need to work on my math score, however, here are my scores:

English: 33
Math: 18 (I’m in Alg. 2 so I haven’t taken Trig yet and need to brush up my Geometry skills especially)
Reading: 31
Science: 25

Do any of you have any tips on how to raise my math score (as well as the others I suppose)? I hope to retake it in June but I’m still debating. All and any help would be greatly appreciated!!

check out my blog https://agirlvslife.■■■■■■■■■■■■■/2015/04/30/sat-and-act/
I posted all the tips and things you can do to help!

@amzie97 check your PMs