You can change your Google Classroom password via the Settings menu, but note that this changes your password across the range of Google programs.

To delete a Google Classroom class, you'll need to be the head teacher of the course, not just an instructor.

Google account holders, beware: If you have an old Google account, you have just a few more hours to use it or lose it. Beginning Dec. 1, Google will delete inactive accounts and all their contents, ...