I can honestly say that I think what helped me is that I am currently taking chemistry and have biology, microbiology, and A&P under my belt, so studying the science portion was more review then learning. However, i probably spent more time studying that section than any other. My school of choice weighs the composite score and gives additional points for the reading section, so it was important that I try to score as high as I could. I would say make sure you understand subject-verb agreement, difference between topic, theme, main idea, etc, how to balance chemical equations, cells and their parts/functions, meiosis and mitosis and the stages, RNA vs DNA, periodic table, domain, kingdom, phyllum, etc. just to name a few I can think of. I studied using the ATI guide, took the two online practice tests, and I really liked McGraw-Hill 5 Practice Teas Tests. I am trying to type this on my iPad, and anyone who owns one knows they are impossible to type on. Feel free to email me at firstname.lastname@example.org
if you have any more questions. Good luck!!!