The training cadres at the academy have been in existence for years, long before this current intake of cadets. They have their own history, mottos, and reputation. It’s convenient to think of them as if they are school houses in a certain educational establishment for sorcerers. Therefore your cadets will not have been part of this cadre for very long – you will be newly assigned to it. That doesn’t mean that you can’t have past relationships with the people in your cadre; often you will all have been recruited from a similar part of the country, or under the banner of a particular noble, or by sponsorship from the church.
When designing your cadre, think about the history, ethos, and reputation of this institution that your cadet or servant is about to join.