We had to read up beforehand, because topics in the classes did not parallel the lectures - so it was common that the ~24 hours of set work for the class(es) would be completely unknown material for us.
My study strategy was to read the chapter topic in two different general organic texts, making notes, and then start the set work. Then, as required, dip back into reading (often more advanced specialist texts this time) when things got difficult.
I think being forced to learn how to study independently was very good for me, and I think it's a skill everyone has to develop.