Problem is, grades are at best a proxy measure for academic potential and are usually set with the underlying assumption of certain basics in teaching, career advice, continuity and family support. Where this assumed factors aren't present, the proxy measure doesn't hold.It's why I'd like to see a return of grants. Based on academic achievement and wealth. Or straight A student from poor back ground = free ride, low grades from rich back ground = no help.
I'd liken it to the old standing jump gym test. You place your mark on the wall then place another as high above it as you can. If all you're interested in is how high up the wall the second mark is, you don't need to bother with the first - but if what you're interested in is how high the individual can jump...