@oligrayeug1 For Math, solve the problem and move on to the next one, unless you are certain you made a mistake. If you want to check your answer, circle it and come back to it at the end, if you have time. Also, your calculator is your best friend if you are familiar with it. I used the TI-Nspire. Practice with the polynomial roots function and the solving systems of equations functions, for they can save a lot of time. In addition, the graphing function is very helpful even for applications you would not expect.
For Science, read the passage, or at least the first paragraph, but don’t get bogged down by numbers and measurements. I know this goes against what everyone else says, but it works for me. Make sure you understand the experiment. In the Fighting Scientists portion, underline the key differences in each theory.
What math classes have you taken and which math classes does your school offer? Taking Precal/Trig helped me immensely.