Help Improving Scores Before April ACT

So I recently took a practice ACT(Just to see how I did) from the official ACT Website, here are my scores:

English: 21

Math: 28

Reading: 32

Science: 32

Now with English thats my main issue, I have never been amazing at grammar or anything related in that test. I’m not shocked I didn’t do well considering, I just wanted to see how well I would do without studying. I primarily need help with the English section, since I talked to my math teacher and I realized that the ones I did get wrong I just over thought them and some I just never saw them anywhere else so he will be helping me on that. If you guys have any recommendations for improving the English and overall score that would be great :)!