When he says G chem, orgo, and bio he means G chem I and II, orgo I and II, and bio I and II. But occasionally they might throw in a question based on a topic you havnt had (esp in bio section) so just be prepared for that. For example, I never had any ecological principles in my bio classes. I had that stuff in ecology. Also we didnt have hardly ANY genetics in my gen bio classes. So its BEST to have taken more than gen bio for the DAT if you ask me, but it can be done.