I would usually start with physics, then do some biology, then some gchem. Either in the same day or over a span of a couple days. Tried to digest things in small chunks. Every couple days I'd squeeze in some verbal (mosty EK and TPR stuff). I really didn't study much ochem at all, because that was my strongest subject and had recently taken it. Physics, on the other hand, was my weakest subject, so I spent more time on that.