School, College and Company

School: 
 Two books for one subject.

College:
One book for all subjects.

Company:
Books? What are they? Only follow standards.


School:
A White pipe in teacher's hand - CHALK

College:
A White pipe in student's hand  PEN

Company:
A White pipe in employee's hand  100% CIGARETTE
   
School:
Most Frequent letter- LEAVE LETTER

College:
Most Frequent letter- LOVE LETTER

Company:
Most Frequent letter- RESIGNATION LETTER  

School:
If we go it's boring.

College:
If we don't go it's boring.

Company: Go/don't go, it's boring