Do you feel pressurized when someone expected you to produce the best result? I believe most people would definitely be stressed. As a parent myself, I usually try not to pressurize my kids especially when they are going to sit for the government exams.
We have heard of cases whereby students committed suicide even though their results were excellent. Why did this happen? Mostly it was due to the high expectation of them. They were already good yet they felt that they must get the best results. When they didn't achieve their ambition, they became depressed and thus committed suicide.
So as a parent myself, I try not to put too much pressure on my kids. I just want them to do their best. Even if their results were not good enough, it doesn't matter as it has already been done.
We just need to encourage them to do their best and probably reward them if they got excellent results.