To impress your teachers, recite to them this traditional English verse:
The boy stood on the burning deck,
Picking his nose like mad;
He rolled it up in tiny balls
And flicked it at his dad.
This will ensure that you are held in high regard in your class.
If for some inexplicable reason this fails to impress, call the teacher a "grade A tit". Please note proper usage is to shorten it simply to "grade", leaving the recipient to remain uncertain of the precise nature of any insult, or indeed uncertain of whether or not they have even been insulted. Please note that this is extremely advanced English usage.
Got that you grade?!
Next lesson: Correct English usage of the term "Med" (nothing to do with the sea or with medications)
Good Lick with your exams!