Benjamin had his own way of dividing them into groups.
Splitting them into groups was just the start. He hoped to train them to quickly adapt the ability to work as a team. To ensure equality, he definitely cannot allow them to choose their own teammates, or else it would have defeated the purpose. Like he said, the magic strength of these people did not matter.
Therefore, this trial period would be crucial.
He would not recruit all one hundred and fifty of them as that will be too extreme. Besides, that would be too difficult to manage and their expenses would increase dramatically. So in the end, Benjamin only intended to keep half of all these ambition mages standing in front of him.
And he had already thought of a way to assess them.