you tried your best, right? theres not much you can do, and schools r happy with even a B... stop stressing focus on your other exams
btw i did a really important maths exam today, coz i want to do engineering, i saw the mark scheme. i was gutted...but i cant go back in time; ive thought of trying to bump my grade back up by doing well in the next exam; you should do the same... i honestly had tears in my eyes... but have faith... i always find that when i think ive done bad i do well and vice versa... honestly stop thinking about, have good night rest and focus on wats coming