Test papers work best when they are used as a routine, not just before exams. Here is a simple plan.
1. Finish the chapter first
Attempt a chapter test only after you have studied the chapter and solved the textbook exercises.
2. Follow the time limit
Every test paper shows its duration. Set a timer and stop when time is over, so that you learn to manage the real paper.
3. Check, then fix
Mark your answers, list the mistakes and revise those topics again. Attempt the same chapter test after a week to see the improvement.