Depending on the topic given by your teacher, a helpful strategy is to practice with sample questions or previous tests. This can help you become familiar with the format of the test and the types of questions that will be asked. It can also help you identify areas where you need to mostly focus on.
And to do all that, it's important to preserve your mental health during test preparations which means getting enough sleep, taking breaks to exercise or relax. Avoid overdoing it to keep your mind intact which can help you stay focused and perform at your best during the test. I hope this was helpful.
Good luck!