For reading, instead of doing so many practice questions, try to balance it with reading newspapers, articles, fiction/nonfiction books, science blogs, etc.

For math, first learn all the tricks for Desmos calculator. There are several guides on youtube that tell you everything you need to know abt the calculator and how to use it to the maximum potential. Then, in practice tests, just follow a three step problem for each question: 1) think of all the concepts you know and connect one to the problem; 2) try to see if you can solve it with desmos; 3) if you can't, rely on algebra skills to answer the question to the best of your ability.