Here are some support material that may help you with your organic chemistry. Organic Chemistry is no longer on the AP Exam but you are expected to recognize some of the functional groups. It will also help you with some Lewis structures if you recognize what functional groups are present from the name of the molecule.
A good website with organic: http://chemistry.boisestate.edu/people/richardbanks/organic/nomenclature/organicnomenclature1.htm