Random student selection from groups.

[AdamHensley]

I get what you're saying. It’s a tricky situation! One way to tackle this might be to shuffle the groups separately and then interleave them, so you alternate between grade levels. For example, pick one student from Group 9, then one from Group 10, then Group 11, and so on. This way, you ensure that students from the same grade level don’t end up together. It might require some coding or a bit of manual sorting, but it should do the trick!