Here's a good idea if you're going to update the game again:
Scenario: You're studying but you hear something.
Option 1: Investigate it
You get off your seat but get expelled. (-4 int)
if cha > 33
You get off your seat to investigate. Suddenly your teacher sees. She tries to expel you but your charm is far too high.
Option 2: Ignore it and continue studying
Well done, you could have been in serious trouble. (+3 int)
Option 3: Tell everyone in the school
Everyone does not believe it. You tell them that it is real. (-5 att)
if cha > 63
Everyone believes you. In assembly everyone in school (including you) is told about the sound. (+3 int)