Post grad is far more competitive than undergrad entry.
I'd advise to resit your english and physics GCSE's
apply to uni's who don't really care about GCSE's (check requirements)
And if you don't get in do a Gap.
I got 2A* 1A 6B's and a C so not amazing GCSE's like a lot of people on here do, but I still got in this year after a gap and working within the NHS.
Also nursing is competitive in it's own right.
And there's no funding for postgrads.