Erase: Intriguing, but it's hard to tell if Gab is the main character, or the friends are. It's also a little wordy. Try moving it around a little, like: Classmates reconnect when an accident leaves young Gab in a coma. Can they mend their friendships, or is what's in the past broken forever?
Wallflower Boy: This one shows off the story's theme of fate, and the main character's personality, well. It's also a little wordy, though. Try to cut out repeated ideas, like Arthur's shyness and fate forging a path. For example: Arthur, a true wallflower, meets a beautiful girl by the bus. He knows he's got to believe that destiny will lead him back to her, but he has his doubts.
Spring Fling: Maybe this is personal preference, but I feel like this reveals a little too much. I also feel like it would be rude to rewrite all your descriptions, so I think two's enough, unless you say otherwise. Good use of rhetorical questions, by the way.
His Secret: This is the opposite of the last one. Again, good characterization: Sandra's clearly excited about getting to know Johnny. The description turned dramatically from romance to mystery, though, and while that can be very exciting within a story, when in a few sentence long description, it can be jarring and confusing. Maybe add a few words about why Sandra thinks Johnny's hiding something, or how serious the secret is (murder? cult leader? Gay?)
I was most intrigued by Erase. It sounds like the kids had something to do with the accident, and if they didn't, then I'd really like to know why a bunch of quasi-enemies suddenly want to be friends again.
Anyway, good luck to you! Have fun. 