Get the two books: Organic Chemistry as a second language (First semester and Second semester). Read it thoroughly and the concepts will become clear. Then do Chad's Videos (either from his site or course saver) and do his practice problems. Supplement with Youtube videos (specially Khan academy and Professor Dave explains). In a worst case scenario, if you are still not understanding, then start watching "Sean Hickey" on ItunesU; hes a university of New Orleans professor that records EVERY single one of his actual lectures and posts them up with supplementary videos (all for free by the way). And finally do Destroyer. People here will tell you to not to but I knew a few people that took the DAT and did well on the Orgo section before taking it with me. It'll need A LOT of discipline but totally doable, you were gonna teach yourself orgo for the actual class, why not start now? haha