They aren't listed as pre-reqs for each other, but they do seem to cover very similar topics. Has anyone taken 3II3 before 2II3? How was it?

They aren't listed as pre-reqs so the chem bio students can take 3II3. They are similar, but don't really cover the same topics. 2II3 is main group and 3II3 is transition metals. There are always a few people each year who haven't taken 2II3 first. There are a couple things that might need explaining, but when Dr. Vargas taught it in my year, he was very aware of who those people were and made sure they understood. You should be fine.