Harry Potter

Okay so because I have been so flipping bored over the break I've been rereading the Harry Potter series. I'm on #5 right now and I just have few questions for JK Rowling to answer.

1) It was proved in book 2 that Hagrid wasn't the one who opened the Chamber of Secrets so why didn't he get his wand back and his wizarding powers in the end?!?!?

2) When they go to the Quiddich world cup or whatever why do the wizards have such a hard time wearing muggle clothing considering that during the ride to Hogwarts all of the wizard children wear muggle clothes?

3) Why don't they take regular classes like math and english. How are they going to know how to read a write?! I mean sure thier parents can teach them at home but they go to Hogwarts when they are eleven how would you like to be reading at a fifth grade reading level for the rest of your life?!

4) Why do Harry and his friends always get rewarded in the end even though they've broken a million rules and people are always dying?

5) Shouldn't they have to like retake thier last year of school?

Anyways this is the dorkiest post ever and as I remember more of the questions I had I will post them but this is just a testament to how bored I truly am.