White
The test of Gambler's academy is unique compared to the Olympian academies.
One reason is that there is actually no upperlimit to the number of people accepted into this place. If all the candidates pass the test, then they can get into the academy as the freshmen. But the problem is even with that open ended entry, the number of students that get into gambler's academy is actually less than most of the Olympian academies.
That is because of the uniqueness of the testing procedure.
And in this the seniors are more hands on because they are the conductors of the test.
The rules are simple.
The candidate for the exam has to pick of the senior students. Whoever it is, as long as they are part of the gambler's academy and they are of at least middle stage Divine Plane cultivators, then they can be chosen.
The senior doesn't have any other choice but to accept.