dw, i do 3 unit and i got about 85% for the term 1 test and failed the last two by one mark. trials we are getting back soon, and i'm pretty sure i failed that as well.
i would still suggest you keep it, if you're workload isn't overwhelming, but if it's actually burdening you you can drop. i don't think it'd affect uni entry but you just have to do uber well in general maths so the scaling doesn't affect you so much.
p.s. general maths is easy stuff! you can top it if you tried.