The odd thing happened on me.

The HM picked up someone else's resume, and thought that was me!

A few things I need to work on:
1.Straighten the right job-hunting philosophy, - you should know well what you have done, focus on the job skills,  instead of the interview skills.

2. More preparation, including the interviewer's background, the company's profile, and all the potential questions.

3. Stay calm and pleasant.