Maxim 1 It has potential...
I figured out why my music sounds so bad in this game... You have it programmed so that as soon as you go to a different room, the music starts to play again without stopping the one already playing, so once you go into a room and back out, you have the music layered on itself 3 times, and it sounds really bad.
You can probably fix that really easily though. (I don't know much about flash, but it should be possible to make the music loop, instead of just starting it when each room starts)
You also have a lot of grammatical errors, which you should probably fix.
Other than that, I think this game has potential. There's not much in it right now, but I think you could expand it into a pretty huge explorable school. You should maybe add some conversation trees with other characters, and maybe some different side-missions for people.
Aside from the music glitch and grammar mistakes, there's nothing really wrong with the game right now, you just need to add a lot more stuff.