Would like to create study groups, similar to the group function of learning software

Each teacher specializes in different trading theories, for example, some are good at [wave theory], a little good at [Gann theory], a little good at [price behavior], he himself has a lot of students.
Every day you need to set up trading exercises, and then let the group members according to the layout of the trading theory for the group pk.
This group function hope that students do not have to pay, but the teacher through the purchase of different packages that can accommodate different numbers of members, the