Just transferred from community college taken Ochem 1, now taking Ochem 2 and having trouble. What do I do?

Hey guys, I just transferred here from community college and took Ochem 1 while I was there. First week of classes have already started and I’m realizing that probably 90% of the “review” content for Ochem 2, I have never learned. I plan on attending a lot of office hours, but idk where or what to begin asking help with. Was just wondering if anyone else has been in this situation and if so, what should I do?