It isn't cheating.
Plus, your work may not even be sent off. Marks are sent off, then the exam board requests the work of a certain number of candidates. Usually for a class of 20-30, every 4th persons coursework is sent.
However, if yours is sent off, and the standard is lower than the mark, then you risk everyone in your class/year having their mark reduced if the other work sent off is also of a lower standard.
Do you want that guilt to be with you forever?
Many of your friends and classmates will fail in life because of what you'll have done.
So you'd better improve your coursework.
Of course, I'm joking, but come on, your post is so naive.