Choose a test to attempt. Ensure that you enter your name correctly into the script prompt box, otherwise, your score will not be added to your results record. To check your current scores, you can just do the 'TEST' quiz, which will only take a second or two.
Only your best score will be stored, so there in no need to practice with false names first :-)
The order of the questions will vary each time you attempt the quiz, so the more attempts you take, the more you will learn. These are revision tests, so you should continue to do them until you have scored 100%