There's no substitute for hard work. The best way to prepare for the ACT is to take practice tests. I suggest to all my students to buy the official ACT prep book.
This book has 5 complete practice exams and I suggest doing 1 test per week.
Here's a tentative schedule you should consider following as you prepare for the ACT:
Week 1: Complete Practice test 1
Monday: complete the English section in a single sitting
Tuesday: complete the Math section in a single sitting
Wednesday: complete the Reading section in a single sitting
Thursday: complete the Science section in a single sitting
Weekend: Grade exam and review your incorrect answers and questions you guessed on but scored correctly.
You will repeat this process for the second week. The goal here is to gain exposure to as many questions as possible. After each exam, grade your test and really focus in on the questions you answered incorrectly and understand why. By week 3 you should be relatively comfortable with the exam, its format, and the style of questions asked Here's your schedule for Weeks 3 and 4.
Week 3: Complete Practice test 3
Monday: complete the English + Math sections in a single sitting (2 sections per day)
Tuesday: complete the Reading + Science sections in a single sitting
Later that week: Grade exam and review your incorrect answers and questions you guessed on but scored correctly
You're going to repeat this process for week 4 as well.
Week 5: Complete practice test 5 in a single sitting
At this point you should have a really solid idea of what you are going to score on the ACT.
SHOULD I BE TIMING MYSELF ON EACH SECTION???
ABSOLUTELY. I suggest using a stopwatch instead of a timer. I want my students to time themselves on each section and document how many minutes it takes instead of racing against the clock. I'd rather you be a few minutes slower than expected and finish the questions than rush through the entire section and make careless mistakes.
YOU GOT THIS!