Recently saw an article on SUSS dropout rates:
About 20 per cent of SUSS’ parttime students do not make it to the second year. It currently has about 2,000 students who are at-risk, with a cumulative grade point average of 2.3 and below out of 5.
Students get an academic warning from the university if their cumulative grade point average falls below 2.0 out of 5 for the first time. The second time it happens, they are terminated. About 20 per cent of students in each intake receive an academic warning.
I think it is because of the difficult nature of part-time study; the students are actually adults who are working in the day, and studying in the evening/night. I can imagine that the daily routine can get quite tiring: 9am-5pm work and 6-10pm (?) lectures, not to mention homework and projects. It takes tremendous motivation and discipline to repeat the process for 3 to 4 years.