Because the paper that we had was hideous. An A level question that we haven't learnt came up, most of the questions were irrelevant to the B2 topic and literally all of the questions were 'how science works' questions. Also, the style questions in that paper was so different and it threw most people off. So yeah
8th marchhh ohhhh, my unit 1 paper was hideous too, one topic was even from additional science! and for physics too! i hope i scraped a C at least in both papers but i'm working really hard for additional to get A* -- past papers & learning all topics in the book, good luck guys!