I have faced disappointment in both areas, as a participant and also as a teacher/coach.
We tend to give too much hope to good performance and forget that consistency is the most important.
It is useless to be able to spike, serve well during training and let fear takes over in a match. When we can do very well in some questions, doesn't mean we can answer all similar questions.
In the end, the process of refining how I coach/ teach, becomes more meaningful and motivating than the final results.
My players trained hard but didn't get the results, my pupils were lazy and kept telling me they are stressed and have too much work.
Effort does not gives u results, it however will likely give u progress.
Let hope those who passes me fear no hardship and progess in life.