When the students are appearing at the exam, all of them feel a common problem, that is checking time.
As the advancement of the technology,students are getting accustomed to check time in the cell phone. There are very few students who wears wrist watch and check their time from wrist watch.
As using cell phone in the exam hall is prohibited, then they face the main problem. They have asked their teacher frequently in the hall which is really disturbing for them.
If there are two faculties in one exam hall, they may not have the same time in both of their watch. Then they face another problem.
So it requires wall clock in each room of exam hall. It'll not cost enough money but will give a lot for the students.Sometimes students become confused that teachers are telling correct time or not. So the problem of confusion will be removed.
If there have any fear of losing it, they can only use clock for exam time.
I got the idea from one of my colleagues after discussing this problem.