After doing biology A-level I would say that in my experience, AQA are the most unreliable and unfair exam board I have ever taken an exam with! How can someone who consistently does well and revises hard go from getting an A in June to an E (Only one mark above a U may i add) in the space of few months? It wasn't even a difficult paper! ARGH they frustrate me lol! Our Unit 4 results were chaos, in my class there were A* students failing, and failing students getting A's!