Do we know as much as a person of our qualification should?
Do we at all know as much as a graduate student should?
You know your self best, but my answer would be no.
Perhaps it will always remain no.
For Vidyarthi* (he who seeks knowledge i.e. student) is my name and so it shall remain as long as I live.
And if your answer is yes, it is both the best and the worst of things.
The best thing is that you would be satisfied with life.
And the worst thing is, that you would be satisfied with life.
Realize the importance of time that you have, and make the most of it.