Privacy Policy
Last updated: November 2026
This policy explains what ChangYeng (changyeng.in) (ChangYeng (changyeng.in)) collects, why, and the choices you have.
What we collect
- Account details: name, email address, role (student, teacher or admin) and your password in hashed form (we cannot read it).
- Learning activity: tests you start and submit, your answers and scores, classes you join, and notifications sent to you.
- Teacher content: classes, exams, questions, pictures and links that teachers add.
- Payments: order and payment reference numbers, amounts and status. Card, UPI and bank details are handled by Razorpay and are never stored by us.
How we use it
To run your account, deliver and mark tests, show results to you and, for class exams, to your teacher, process payments, send service messages (such as password resets), keep the site secure and fix problems. We do not sell your data and we do not show advertising.
Cookies and similar technology
We use one essential cookie to keep you signed in. We do not use advertising or tracking cookies. The installed app stores a small cache so the site opens quickly.
Other services
Razorpay processes payments. Page styling, icons and the formula display are loaded from content delivery networks, which may receive your IP address. If you press Watch on a teacher's video, it plays from YouTube in privacy-enhanced mode.
Who can see your information
You, the teachers of classes you join (your name, email and results in their classes), and administrators who run the site. We share information with authorities only where the law requires it.
Keeping and deleting data
We keep your data while your account is active. Payment records are kept as long as the law requires. You can ask us to correct or delete your account by writing to [email protected].
Security
Passwords are hashed, connections use HTTPS, and access to data is restricted by role. No system is perfectly secure, so please choose a strong password.
Children
The site is meant for learners and teachers. Learners under 18 should use it with a parent or guardian's consent.
Changes and contact
We will post changes here. Questions or requests: [email protected].