guys i really need help, I got C in physics C in biology B in math and B in chemistry. But I expected a straight A. I did very well in physics and biology dont know how i got a C i am sure that 80 % of my answers are right, and i expected an A* in chemistry I am totally sure that i didnt make any mistake in papers 3 , so my questions are : are my grades bad ? 2- Why i got a Cs if I studied that much hard :'(, EL7AMDUALLH