second year biomed student here!! 😁 congrats on getting your offer!
So, you're right in that all the bioscience students have the exact same first year structure. In my experience with the CYO (unsure if they've changed it since), you had a split of modules across semester A (sep-dec) and semester B (jan-mar/apr). Cell Bio and Biochemistry were Sem A specific, Chemistry and (I think) Genetics were Sem B specific, and everything else ran across both. The thing with the CYO timetable was that, unlike pretty much every other course and second/third year, there's zero structure. Modules were mixed across days and how much you had on a given day very much depended on what tutorial group you were in. Some days you'd have a lecture or two and a tutorial, or you might have a few tutorials, or a few lectures, or just a practical, or nothing at all. Unfortunately my timetable from last year has vanished off my calendar, but from memory it was rare to be in for more than a few hours a day. Pretty sure we did have a lot of 9ams though 🥲