Edward handed them the anonymity contracts and asked the students to sign them.
He gave the reason that since there were 33 of them present here vying for those 20 seats, there were going to be 13 unsatisfied students who might leak what took place at this place to get their revenge.
By signing the contracts, every student would be granted anonymity whether they win or lose those seats. This would allow the students to bid for the twenty seats without worrying about revenge from the ones who couldn't secure their place.
The students found sense in Edward's statements. This was a Master Ranker's class after all. This was a huge opportunity for them to make contact with the potioneering of that stage and understand its principles. They wouldn't miss such an opportunity by chickening out from the opportunity presented by their inside man in the academy.