Reading
The reading section of the TEAS can feel very time-pressured. It's easy to end up running out of time. After all, you only get 55 minutes to answer 45 questions. I recommend taking your practice tests with a timer, if possible. I’d like to note that there is also some jargon to be familiar with for this section, like “primary source,” “secondary source,” and “tertiary source.”
Math
Brandon Craft has amazing videos on YouTube and they cover pretty much everything you’d need to know. He provides the material, but practicing is what really counts. You can get practice questions from all kinds of sources, but the ones that were the most like the real exam (in my experience) were from the Official ATI Practice Tests. Which makes sense, cuz they're official.
During the real exam you may encounter some questions that aren’t so straightforward, and I recommend not avoiding hard practice questions when studying so you can practice figuring out what an answer is even if you don’t exactly know how to solve for it.
Science
The TEAS exam tests you on a wide variety of content (Chemistry, A&P, Biology, Scientific Reasoning), but the questions themselves can be rather surface-level. If you have a good grasp on the info, you should be good. Example question: What kind of joint is formed between the humerus and scapula? Answer Choices: Hinge, Ball-and-socket, Saddle.
I recommend using spaced repetition flashcards for memorization. My go-to is Anki for making them! For topics that are harder to understand, like nephrons and mitosis/meiosis, you can watch YouTube videos. Amoeba Sisters and Science with Susanna are amazing. When I took my exam, all that I had learned about mitosis and meiosis came from Amoeba Sisters, and the level of information was just right, lol.
Work in progress~