Different triggers for different people, I guess. I think the passive voice is OK when used sparingly.
It doesn't matter who does the dividing - public school policy is heterogeneous grouping. Administration thinks that mixing kids of differing ability is advantageous.
Unfortunately, in public schools, the student is not the customer in the typical sense. Maybe a quasi-customer at best.
RE: Trigger Warning - Students Should be Grouped by Intelligence and Ability