What do all of these orbitals mean? The S orbital, and the P orbital? Do I just have to memorize it?

The orbitals are the fundamental concepts you must understand in order to not only score 100s but to move up in chemistry. You can't think of the s orbital as just the first shell. Sure it does come before the P, but you have to understand how and why. The S orbital, for example, is circular, therefore, not reaching wide enough as the P shell, which is made of two oval shapes.

Do I have to memorize every bolded word on my textbook? Is biology anything but memorization?

I get this question a lot. Being a neuroscience major, I have learned why biology is so important to understand. The short answer is no, and no. Memorizing is a waste of time. Sure you'll spend 2 hours wasting your time memorizing words which you'll forget in a matter of days. However, creating a concept map in which you tie all these words together is the real secret behind getting that 100% on the test.

Why do I always run out of time on each section? Especially reading? How can I manage my time better while being efficient?

Time is the biggest trick on this test. By timing everything perfectly, you are guaranteed on getting at least a 32. On the reading section for example, a lot of tutors tell you to read a paragraph, underline some words and paraphrase it in a sentence. That right there takes an extra minute you crucially need. That extra minute could mean an extra point on the ACT. Instead, you have to skim and create a road map in your head. I will teach you how to do that efficiently so that you can get a perfect score.