Engineers !!!

A boy goes to shop and purchases a big book.

He takes the book to a medical student and asks him how much time will he take to finish the book.

The Medical guy says 6 month's minimum...

Then he goes to a law student and asks the same question, he says minimum 3 months.

Then he goes to an engineer and asks the same question.

How much time will you take to finish the book !

The engineer asks, "Exam kab hai...!?!"