I took a story off of /b/ from a baww thread and copied it word for word and added my own stuff to it to make it long enough. My grade was:
"A+, one of the best I've read!". Even got it pinned on the wall of fame and stuff hell yeaaaaah 10th grade ruled.
Also did the same thing 11th grade. Got a 98 on it. Just go start a baww thread and take a story from there.
EDIT: My 10th grade story was something about a guy confessing his feelings for a girl before she moves and on her way over to his house to tell him she felt the same a drunk driver killed her. Blah blah blah add dramatic scene with the guy and the girl's best friend being mad at him, emotional bull stuff, more emotional bullstuff, the stress of life and stuff, aaaaand add a final "artsy" sentence that implies he kills himself but don't ever make him say "IM GONNA KILL MYSELF". Make it slightly open ended so the reader thinks they are smart for figuring out he kills himself when really everyone will understand it.