Bizzey it depends on the options they've sat and I've only looked at geography boundaries, but 67% is required for an A*(161 marks), A (143 marks).
Dunlurking DD is ok about grade boundaries. She thinks she picked up about approx 160 marks, so a high A. She's needs an A so hopefully can afford to miscalculate.
Potentially in for a massive car bill, one part is £250, if the second is needed it's £600! So much for buying a newer car, it's only five years old.