No this will not automatically be canceled.

Yes you may attempt to enter but may be questioned about I130 approval and intent.

It is not recommended to file only one form online. Mail may be better.

This is possible if otherwise eligible.

This may be a scam. Contact law enforcement to confirm.

The marriage certificate acts as legal proof of name change.

Yes advisable to wait and to consult with an attorney for review of record.

Yes you may attend school while on U visa status.

Attend the biometrics appointment based on recent notice.

The answer appears to be yes based on information provided.