If you have not passed the pre-test, it is likely you will benefit from the tutorials for Beginners. If you passed the pre-test but not with a perfect score, it is likely you will benefit from reviewing the topics you missed by looking at specific tutorials addressing those topics.  Some suggestions are provided below (you have to be a registered user to access most of the materials):

If you passed the pre-test with a perfect score, you are likely too advanced for the tutorials for Beginners. We will soon have resources available for more advanced study. These resources may better suit your needs.