I did aero eng although graduated 4 years ago. IMHO you'll find the level of the exams easier than aero eng. There is a hell of a lot of stuff to learn, but the difficulty level isn't that bad - it does feel it at the time and I could be corrected by the next set of subjects as I'm only half way through. I would say it is around 1st year level. I think a lot depends on the quality of notes and feedback. I had two options - full time at glasgow or distance learning elsewhere. I went for the distance learning, based on reputation and haven't been disappointed.