..it needs to be hard for the "Group 1" people above...but does not need to be anywhere near so hard for the "group 2" people.
The 'group 2' people shouldn't be taking a degree then
If you're talking about NOT doing integrals (and similar maths), then it's not really going to be any kind of worthwhile course - perhaps you could rename it '11 plus'
Integrals and differentiation were part of O Level Maths when I was at school, and we also did it at college - ETV day release course (Electronics and TeleVision).