Cannot improve ACT English .....

I’m so frustrated. Currently, I done almost like 10 ACT English practice test, and I have no score improvement. I constantly get around 8-10 wrong with 1 test being an exception with only 3 wrong. I probably got lucky on that one test, because I cannot replicate the results. I looked at everything I did wrong and understood the mistakes I made. Furthermore, I even looked at my correct answers and understood why they are correct (because some of them could be lucky guess). Why is my English score not improving?

P.S
I been focusing only on English section and nothing else. I thought by doing this, it would increase the chance of improvement, as I would not be distracted by other sections. However, constant bad results actually hampered performance as I begin to doubt all my answer choices.

P.P.S
feel free to correct all the grammatical mistakes I made in this post.

That’s a good start to improving your English score.

Currently, I have done 10 ACT English practice tests…
because some of them could be lucky guesses
I have been focusing only on the English section and nothing else.

etc.

While grammar rules are helpful, try to just read the sentence in your head and pick what sounds right. The success of this method is further aided by the practice of proper grammar in your daily life (whether it’s in e-mails, CC posts, daily conversations with friends or even on Facebook or text). It’ll be weird at first when you’re suddenly paying attention to the grammar that you use in your texts, but you’ll eventually get used to it (as will your friends).