Worst case scenario they say no, and you have 4 other options to potentially get 2 offers from; provided you intelligently select your other options to have an approrpiate range of entry criteria to maximise your chance of getting offers, it's no great loss if one turns out to be a dud from the start.
I would suggest it's a longshot unless your teacher(s) can indicate in your academic reference why they haven't predicted you the relevant grades for the course; however good performance in the NSAA and an appropriate reference may net you an interview, and if you do very well in that you may get an offer (which will almost certainly be A*A*A or higher though).