Not all science students have to enrol @ campus.
I know a couple of friends who will be doing a science degree @ UTS but they finished their timetable.
Not really though.
I know a couple of my friends who missed out on high E3s, let alone E4s, for MX1, nevertheless, they did alright in MX2. [they got mid E3s for MX1 and MX2]
Also, 4U students may miss out on a high E3 or E4 for MX1 not because they are weak but because they need to study for...
Imho, Harry Potter series is annoying because of all the romance involved. It ruins the whole series. Harry Potter series would be much better if it only focused on the action, adventure and fantasy.