I never took a math class at NCC because I took a placement test at the very beginning, and it placed me above the requirements. With the placement test results I was able to register for all the other classes that have math as a pre-requisite.
I loved chemistry, and what I liked about it especially was that it made you very serious about doing homework and studying. You need to be very persistent in order to succeed in the other classes, such as A&P, and chemistry teaches you to be that. I personally found chemistry to be pretty easy, but of course that is because I took chemistry in high school and had very good teachers. In any case, I think that everybody who wants to be a nurse should be able to get a good grade in chemistry, since that's just the beginning of everything. The book is great and even when I didn't understand something, I would go home and read the chapter, and focus, and re-read if necessary, to make sure I understood everything. You want to make it a goal to understand everything, because you will need this skill later, in other classes. The tutoring center at NCC has great tutors who can help with both math, and chemistry, if necessary.
About the Teas... when I registered for the test I decided to take it once, just to see what it's like, and I didn't study AT ALL! I thought I would take it again, for the score. But I ended up getting 84% from the first time, and was advised that it's a great score and I didn't need higher, so I didn't bother to take it again. I don't think TEAS is a difficult test. Math is based on fractions, percentages, knowing how to work with decimal places (which is also taught in chemistry), simple equations and things like that. There are some A&P questions, some chemistry questions and there were also physics questions. Now I totally guessed on the physics questions, cause I only took physics in High school and never liked it. Anyway, my suggestion is that you can take the TEAS whenever you want to see just what it's like, and then, if necessary, take it again when you finish at least A&P I. There are questions that you won't know unless you took A&P.
Good luck with math and chemistry and let me know if you have any questions!
PS: For A&P and microbiology , ******* is the best professor. She is tough, but very nice and very helpful and fair.