The courses are highly open, almost everything is given publicly except solutions, many of which are given to teachers only. Well done!
Course materials for each year are stored in URLs of type: www.cl.cam.ac.uk/teaching/2223/, e.g. that was for the academic year of 2022-2023.
Their organization is interesting, and allows students to take broad courses on year 1 and 2 and only pick a specialization in year 3 without having to decide upfront when the join the university. This is the correct way of doing it pre-Web.
As per www.natsci.tripos.cam.ac.uk/course-structure as of 2026, the way the course works is:

Articles by others on the same topic (1)