Without paying expenses, how would one prep for the ACT?
We have a multitude of free, high-quality ACT prep resources on the PrepScholar blog. For a comprehensive list of links to our ACT-specific articles and guides (including test strategies and focused subject guides), I highly recommend this article. We also have a complete list of free official ACT practice tests and questions and a page chock-full of free ACT resources, including our free eBooks with advice on how to calculate your target ACT score, ACT strategies, ACT prep methods, and how the ACT can affect your future.
My other recommendation for free ACT prep is to see if your local or school library has copies of the official ACT "red books" - either the Real ACT Prep Guide, 3rd Edition, or the recently released Official ACT Prep Guide, 2016-2017 (1st Edition). You can't mark up the library books, of course, but you can take the practice tests on separate paper and learn more about the test without having to pay a dime. Just keep in mind that the Real ACT Prep Guide, 3rd Edition doesn't have up-to-date essay prompts and has different subscores than the current ACT.