Is it healthy to stress on deadlines, tests? What can society do to de-emphasize this pressure?

Answer 1

It's probably not "healthy" but, on the other hand, everything has some kind of stress level associated with it. It just depends on how MUCH you stress out about it.

I'd say society would want to teach various methods on how to study subjects well for tests.

For deadlines, society would want to teach how to break up a task into smaller parts and have little deadlines to meet so that it is all done by the big deadline time.