http://web.chem.ucla.edu/~harding/
This is the website of my organic chem prof at UCLA. You can click around on the practice materials, called CFQ (concept focus questions) and PP (Practice probelms). It is very comprehensive, I only used that for the most part. Chem 14C and 14D are the life science organic chem materials, 30B is physical science organic chem materials. It doesn't vary too much but you can click around to see which is most pertinant too you.
Good luck!