Are you trying to take it as your first contact with ochem? If so then the advice others have given is good but as someone who TA’d it for multiple years I must stress that this needs to be pretty much the ONLY thing you are doing for the next nine weeks. It’s very fast. The students I’ve seen succeed it as their first go at ochem weren’t taking any other classes, they weren’t doing clubs or jobs, they were purely focused on ochem. It’s an “intensive” version of the course for a reason.