commerce-students/commerce-students.github.io ? reverse-engineered prompt

Build me a polished study website for CBSE Commerce students in Classes 11 and 12. I want it to help with Accountancy, Business Studies, Economics, English, and Information Technology, and guide students through learning, practice, revision, and tests in a simple way.

The site should feel fast, clean, and mobile friendly, with a student dashboard, subject and chapter browsing, lesson pages with explanations and key points, practice questions with instant answers, a mistake notebook, weak topic tracking, daily practice suggestions, revision tools for formulas and definitions, and a small AI study helper that can explain things and quiz the student, but clearly says when it is only an offline demo.

Keep everything working without a backend, save progress locally in the browser, and make it look good on phones and desktop. If you need to look up current docs online while building, go ahead.