There will not be a final exam, as we think of it. The Lord will not ask questions of us to ascertain if we have the Faith required.
The Lord knows our hearts and He will tell us, not ask us.
It is good, at any age, to study and to question the lord about the condition of our hearts. He WILL answer and give, I believe, us the opportunity to come into a true relationship with him, if we seek him.
Blessings