DeAndre,
A lot of aspiring pilots like yourself want to start reading as much as they can before they start flight training. I’ll tell you that it will be difficult to comprehend most of what you read out of an aviation textbook. If you want the challenge, you can read as much as you want. The FAA has PDFs of the Pilot’s Handbook of Aeronautical Knowledge and the Airplane Fliying Handbook, among others.
Most people actually find that taking as many written tests as they can prior to beginning flight training to be a better use of their time.
https://atpflightschool.com/faqs/acpp-prep-written-knowledge-tests.html. This link explains how to do that. Most people choose to spend more time studying for these tests, because they know that if they complete them early, they will have more time DURING the program to focus on more important things.
Also, you say that you have 2 years left of undergrad, plus 3 months until you’ll be ready to begin. If you plan to take the written tests, don’t take the tests too early. The test results are only valid for 24 calendar months. So, how much time should you give yourself to prepare? It varies person to person.
If all you did was study all day, every day, you could take the three core tests (PAR, IRA and CAX) over the span of one month. If you are the type of person that needs more time to study, add however much time you need. 2-3 months is conservative.
So, to recap, read FAA publications at your leisure, but don’t get irritated if the concepts are too difficult to grasp. Without context and the guidance from an instructor, it is very difficult to learn. If you choose to study for the written tests, follow the instructions provided and take the tests as close as you can to your start date. Don’t worry about not actually learning the concepts while preparing to take the written tests. The tests themselves primarily require only memorization. I know it may be hard to believe, but it’s true. The real learning will begin after you’ve started training with an instructor.
Tory