Beginner's Guide to Lunch Lady Basic

The game puts us fully in this chase and we are not told exactly what to do, follow these pause to win the game:

Stay away from the lunch lady!
Find 10 blue folders each contains a page of the exam.
Find Keys for corridor A, B, C, the staircase and the principal's office.
When you find a key, open all the doors that the key can open as soon as you can.
Once you have the 10 pages of the exam, everyone (who is alive) should be at the entrance, where they started.

lunch lady bambang