Not sure about other subjects, but maths degree 3rd year (just finished) was BY FAR harder than second. Work load was horrendous and keeping means you will not have the freedom you used to like instead of just needing to work on sunday, it will be saturday and sunday. With 22hr a week timetable
plus i spent the whole year dreading the final exams, the entire 3 years came down to the final 3hrs