Language School Needs a New Platform with Website and Mobile App

I need a site that will have groups of users, Teachers, Students, Administration, (maybe more), and ability to create groups for private classes and notes as posts in these groups. The site needs a scheduler and calendar with notifications to remind Teacher and Student there is a class in 15 minutes. Because this is a language school, I would like to integrate AI for helping teachers with notes and to make the mobile app more of a functional translator tool. This does not need to be like Moodle, where courses are setup, this is just for notes for one-on-one or group sessions. Typeform integration for keeping track of classes. This is already established with users on a CRM platform with a lot more functions than we need. The goal for migrating to a new platform is June 20, 2024 if possible.