I try to sign in on this iPad but it’s say access blocked can u please help me log in

Are you using Apple Private Relay? This feature has been observed to cause difficulties with Google sign-in and search in some circumstances.

If Private Relay is active, as a diagnostic exercise, try disabling this feature:

Settings > [Your Name / Apple Account] > iCloud > [iCloud+ Features] Private Relay > Private Relay - set to OFF

Otherwise, an HTTP 400 Bad Request error (as illustrated in your screenshot) indicates that the server cannot process the request due to a client-side issue, such as a malformed URL, invalid syntax, or corrupted browser cookies. To fix this, try clearing your browser’s cache and cookies. For Safari:

Settings > Apps > Safari > [History & Website Data] Clear History & Website Data

Is this your iPad or a companies/school iPad? If the later you need to contact their tech support.