Remember all vocabulary terms, formulas, etc.
Always take notes.
Practice multiple worksheets.
Don't stress, but do your best on the math test.
Reread the questions to get a better understanding, so silly mistakes don't occur.
Please, please, please always write units.
Always recheck your answers after you finish a quiz or test.
Slant height and height are 2 different things. Do not assume they are the same.
NEVER ASSUME ANY MEASURES IN THE DIAGRAM UNLESS IT IS GIVEN OR CAN BE PROVEN.
Use Paper instead of trying to visualize things in your head.
Make sure that even if you are extremely confident that all your answers are correct, you still take a photo of your work and send it to your teacher. Overconfidence precedes carelessness.
Don't over study, plan well! (I suggest studying for at least 2-5 hours in a week)
Make sure you understand the theorems and not just memorize them.
Start studying for a test from atleast 3 days before. Don't study at the last minute.
Don't ever procrastinate.