How We Built Progga (progga.bd): A RAG-Based AI Tutor That Actually Understands the Bangladeshi Curriculum

A few months ago, one question kept nagging at our team: what if every student had a tutor that never got tired, never got annoyed, and always had their exact textbook open in front of them? We didn't want to build another generic chatbot. Ask ChatGPT or Gemini directly to "explain HSC Physics" and you'll usually get something generic — not aligned with the actual curriculum, and often pulling context from the wrong place entirely. We wanted a system that genuinely reads a student's own textbook