I had 1 passage on the AUGUST MCAT for Organic chem and proabably 2-3 independent questions. Some forms of the test had 4 passages of OCHEM I believe from reading other posts. On the MCAT, first semester principle is covered along with first and second semester reactions. You will eventually need OCHEM to get into medical school in the U.S., but if you plan on taking the MCAT beforehand I would suggest reviewing the relevant topics listed by the AAMC in a review book such as Kaplan or PR to get the basics.