I think It's pretty harsh that none have taken the time to review your story, so I give it a go.
In the last chapter you had the Harry character name all the unforgivabls and then you had the rest of the class do the same, people still got points for just repeating what Harry had said, jesus christ all they had to do was listen!!!
Anyway I think you are a reasonable writer who could with more time and experiance become really good, just keep at it and never give up.
Tour story is interesting but the chjapters need to be slightly longer, i know from stpries posted by myself ages ago that people get pissed when chapters are a lot under 4000 words, tht's what i aim for every time.
Any love interests for Harry?
Could a love interest perhaps help break the memory chrm cast by Voldemort.
You also need to be a little bit more specific on how much he actually knows.
bring more Ron an Hermione and you could have him stealing the stone on voldemorts orders.
keep it up
hitmansam