An interesting story, but I agree with Rogue, above, that it and you would benefit from having a beta. Several of the suggested changes at Hogwarts made a lot of sense, such as having reserve players for Quidditch as well as more than one teacher per subject. And, of course, getting rid of Binns!
Please obtain a beta.
They will help you with issues in your writing, such as capitalizing "screaming" when it is in the middle of a sentence, using the numeral "13" instead of "thirteen" in prose, abbreviating "doctor" as "Dr" within prose, not using the direct address comma, not using a period at the end of a sentence, and other technical concerns.
I'm not saying you don't have an interesting idea. I am suggesting that you would benefit from a little guidance in developing your technique.
Happy writing.