Lewis structures are pretty important on this exam. It’s a good idea to make sure you always count the number of valence electrons and check for octets! I found you a nice tutorial, and here’s a Sporcle quiz if double and triple bonds throw you off. This video might also help:
Here’s a good set of practice problems on VSEPR and molecular geometry if you find you need more to work than the book gives you. These cover a few geometries we didn’t touch on in class, involving expanded octets, so beware!
I also found you a video that might help you visualize polarity in molecules.