I tested many plugin.
but I don't know what how can access limit teacher for management .
* teacher & tutor can have many group.
* teacher watching only they own group. (even same course.)
I saw other posting. but wpmu answer is not exist yet.
now coursepress had multi teacher function in a course .
but impossible "group manager" what group access limit with other plugin combination.
maybe I can make by mulisite & membership pro2 .
this way have many problem. it's not solution.
ex) copy course & user, progress integration, payment way, etc...
so I want group manager's function include in only single site.