Tips to increasing ACT?

Hello! I recently took the ACT with the only studying being what we did in class. It was more of a “let’s see” score.

I got a composite 27

Math: 28
Science: 28
Reading: 26
English: 25

They called 5 minutes when I had about 12 questions left on the math and I didn’t finish the English test. (Didn’t do the last 8). Even on science I took educated guesses on about 3-4.

I need my score to be in the 30’s preferably 31.

What should I do to study? Is it realistic to get my score up to a 31?
I know my math can go up if I were to finish it completely.