For school kids Telegram bots

Telegram's official quiz builder: create multiple-choice quizzes with timers, explanations and media, share by link or inline, and see leaderboards. Free; 1.3 million monthly users.

A rapid-fire trivia bot built specifically for group chats: add it, type "start," and it fires off questions from a bank of 150,000+ with a live per-chat ranking. Free.

A vocabulary-building bot that starts with a quick level test, then feeds you about ten new English words a day with spaced repetition — built for both adult learners and schoolkids.

A focused geography quiz that drills you on national flags — including flags of Russia's federal subjects, not just countries. Free, Russian interface.