Send me your email address for a link to an English Cheat Sheet Plus Big 5 - 5 topics that cover a large portion of English questions.
Read "Complete Guide to ACT English."
Work practice tests. Send email to receive a link to answer explanations for 19+ tests. The explanations are cross referenced with chapters in the "Complete Guide to ACT English".
For questions with no question, if there's an option to DELETE, check it first. It's correct more than 75% of the time.
Shorter is better. When in doubt and when all things equal, choose the shortest answer choice. The Rule of 3 is that if there's an answer choice 3 or more words shorter than all other choices, that short choice is correct over 95% of the time.
If there are two options 3 words or more shorter than the other two options, then 95% one of them is correct. 95% of time, the shortest one is correct.
If there's one choice with a double dash, it's correct 95% of the time.
There are two situations on ACT with a comma before "and" - a list, when a complete sentence follows the and.
Nothing beats working practice tests, then analyzing and reviewing every question you missed. The last step is to re-work the test to make sure you get the formerly missed questions correct.
I can send you practice tests and a lot of materials for ACT prep.