If you had six or less answers correct in the last exercise, don't worry! This can be a tricky subject. In this part, you will be able to study a simpler explanation of what you've learned before.
In the menu on your left, you will see four sections under Course 2A. Starting at the top, please go through these in order, pausing and reviewing where you may need. When you're done, you may complete the exercise at the end of Course 2A.