I think they have to do one first year maths in optom. If you just wanted to pass then you could probably sleep through a fair bit of 1131, but it sounds like you want to keep you WAM high so you'd be better of doing a bit more work and getting the scaling for 1141. Go to some lectures of each and see which you think are the most help for doing the tute questions. At least in 1141 you'l be in tutes with people with the same sorts of marks rather than potentially with people trying to integrate sin(2x) (and higher usually gets better tutors).