Redford High School Escape

This is the school of my father and my grandpa. When my father was studying in this school, he had more than 10 friends. During that time, one of my father friend was missing from that school. My father searched over there. But, he did not get any information about that friend. So, I have decided to visit that school and investigate about that incident. But no one is there. I need to go out from here. Can anyone find out the related objects and solve the puzzles to open the main door and escape from the Redford High School soon. Thanks for playing and Good Luck and Have Fun.