https://t.me/stud_copilot_bot
(source: https://github.com/Kononenko-Daniil/telegram-mini-app-contest/commit/9b7474c305a8707c92dbc982ce4462c4686ae9d0)

Student Copilot bot allows students and teachers to simply create hometasks with specific deadlines. In order to provide better user experience this bot can create groups (student classes), subjects (e.g. Maths, Programming), links to important internet resources.
So this mini-app is really interesting addition for all of this educational stuff that takes place in Telegram (groups with teachers, announcement channels, etc.)