# StudyLessons > A little curiosity everyday. Original, child-friendly topic lessons for Indian NCERT Classes 8, 9 and 10. StudyLessons organizes Science, Mathematics, History, Geography, Civics and Economics by class and NCERT chapter. Physics, Chemistry and Biology are browsing categories within Science. Finished lessons offer short explanations, simulations and quizzes. Unfinished chapters are labelled as coming soon. Official textbook links open at ncert.nic.in. This is an independent learning companion, not an NCERT publication. ## Explore - [Chapter library](https://garry-science-studio-9.ondevtra.chatgpt.site/): Browse classes and subjects; open published topics. - [Sitemap](https://garry-science-studio-9.ondevtra.chatgpt.site/sitemap.xml): Index of published chapters and lessons. - [Official NCERT textbooks](https://ncert.nic.in/textbook.php): Source textbooks and chapter PDFs. ## Learning notes Cognito email-code sign-in is being connected for adult testing. My Learning remains browser-local until the AWS progress API is configured. No behavioural analytics are active. Teacher drafts and uploaded preparation material are private and should not be treated as published educational content.