When I studied physics at Exeter University they still used the tutorial system and finals. Tutorials were held fortnightly; the tutorial groups were typically three or four students. There was no obligation to turn up to lectures or even tutorials. You just had to pass the end of year exams to be allowed to continue to the final. The class of degree that was awarded depended on the open note final exam and the report of the final year project. That report had to be defended orally. Previous years exam papers were available for study as well but the variety of questions that could be asked was so vast that it was rare that any questions were repeated in the finals.

It seems to me that this is pretty much immune to plagiarism as well as being much better for the student.