Proofreading
Let me say that I don't proofread the paper, I have the writer proofread his own paper. NumberOne (12) can get through this without much trouble.
#2 (9) gets frustrated. I think it's probably a learning stage thing. He's also a perfectionist, so he gets upset when he finds mistakes. You know what? This is just character training presenting itself. Keep at it, slowly, and next year may be different;)
An idea is that students could proofread each other's writing. We are not at that stage, but by next year, maybe #'s 2 & 3 could proof read each other's? (Just thinking out loud.)
First I have them proof for capitalization, spelling and punctuation.
After those corrections, I have them read it out loud. If it doesn't "sound right, " then change it by adding transition word and/or rearranging sentences.
Now comes the second draft. This is where you may lose them...they don't generally "want" to pick the pencil up again and write it AGAIN.
I'm being honest, here.