Don't know what you mean exactly at so moment.
If you mean, that B gets stronger while taking the exam, because of the different tests and hard training, than I can just say, that A also can get stronger in this time (by missions and also hard training).
Just tried to keep the exampel easy.
Perhaps there is something aside the test to get the Jounin title, but I haven't seen anything about that yet and it won't really change the situation.

And when it comes to being civilized ... (just read the postings and decide self)