just try your hardest
and if you dont think you are going to finish an essay in time at least quickly write down your quotes, and your main points you were going to use... for example if you were doing an essay on why you should eat weetbix lol just write down quickly:
a) its healthy for you
b)it tastes good
C) its cheap
d) its easy to make and quick
then that way you should at least get a few points
ps: yes i am insane