Oh, I know where you are CR. I went on a 'group' interview once and I was also very anxious. I always think your appearance, good eye contact, a warm handshake, enthusiasm about the position/company, and a smile go a long way on an interview and may be just as if not more important than any one thing you have to say.

Google 'what to do if you get stumped in an interview'. There are some good tips on-line. Try to forget the 'skills' you may or may not have and bring your best personal you to the interview. Plan to call a friend after the interview to review how it went. Knowing you have someone to process it with will help get you through.

Best wishes.