Privacy Policy

Information we collect

• Account details such as your email address and optional display name.
• Study activity, answers, bookmarks, progress, and practice-exam results.
• Guest-study identifiers stored in a secure browser cookie.
• Technical records such as request time, IP address, browser information, errors, and security events.
• Messages, corrections, or explanation feedback you choose to submit.

How we use information

We use this information to operate QSO Study, authenticate users, preserve progress, personalize review, prevent abuse, troubleshoot problems, answer support requests, and understand whether the service is useful. We do not sell personal information.

Cookies and service providers

QSO Study uses essential cookies for signed-in sessions and guest study continuity. Hosting, email delivery, monitoring, and optional privacy-conscious analytics providers may process limited data on our behalf. We do not use advertising cookies or sell data for targeted advertising.

Retention and security

We retain account and study information while it is needed to provide the service, meet security and operational needs, or comply with applicable obligations. We use measures including encrypted transport, secure password hashing, restricted administrative access, and protected session cookies. No online service can guarantee absolute security.

Your choices

You may request access to, correction of, or deletion of your account information. Contact us from the email address associated with the account so we can verify the request. Guest data can also be removed by clearing site data in your browser.

Children and policy changes

QSO Study is a general educational service and is not directed to children under 13. We may update this policy as the service changes; the effective date above identifies the current version.