Originally thought this exam restored my faith that an A was possible, then realised everyone else found it hard probably didn't do as well as I thought haha
Holy * i made a stupid mistake. In the pH of the buffer i did 0.4/0.24 instead of 0.24/0.4 and so got 3.55 instead of 3.99 ahhhhhhhhhhhhhhhh!!!!!!!!!!!!!!!!