This is just my suggestions:
1. Get familiar with basic knowledge, like unit convert, simple equations. You don't have enough time to look for all of them.
2. Keep tracking your time all the time. Before the exam, I wrote the maximum time I need to finish 10 questions, 20 questions, 30 questions, 40 questions and 50 questions on the workbook first page and checked it regularly when I finished 10 questions.
3. Read and comprehend each questions carefully before you work on it. Don't make simple mistakes by rushing too fast.