Hogwarts Hierarchy?

[wings909 at aol.com]

No: HPFGUIDX 13386

This has been bugging me for quite a while in regards to Prefects and Head Boys and Girls.

How many Prefects can each house have?  Was Percy the only one for Gryffindor?

How are the Prefects chosen? Good grades, teachers vote?

According to my best guess, Percy was a Prefect in his fifth year, so is year 5 the year that you can be chosen to be Prefect?

Now onto the Head Students...we all know that James and Lily were both Head Boy and Girl for their year, and both in Gryffindor.  Percy was in Gryffindor and Penelope was in Ravenclaw.  So, are the Head Boy and Girl chosen to be like the best students in the whole school?  

This has just bothered me for some reason...

Cheers,
Paula
Gryffindor (86% obsessed...apparently I don't have a life)