First, I attended an information session they conducted in my school and I talked to the recruiter at the end about internship/career opportunities available at Ernst & Young. She was very nice, approachable and really informative. She asked for my resume at the end and a few weeks later, I got an email from her to apply for the internship opportunity. I applied for it and I got selected for an on-campus interview.
The lady I interviewed with was a senior manager and she was nice. She asked me to take my time to think of the questions before I answered. After she said that, I was very relaxed and not so tensed. That was a very good advice and I'll encourage people who are interviewing to do that as well. It really helps you put your thoughts together.
Then, I got selected for the office interview. The office interview consisted of a presentation, two 1 on 1 interviews and then lunch with other candidates(it was 4 of us). In my opinion, the office interview was much more laid back that the on-campus one I already did. I was so relaxed. It was like we were having a conversation. I asked a lot of questions too. I asked questions I kinda already knew they answers to just so I could keep the conversation going. It was a positive experience in general.
One advice I'll give to anyone is to REALLY believe in yourself and in your abilities and it would radiate in an interview. Ernst & Young is a service industry and they need people who can really represent them in front of clients. If you seem too shaky and unsure of yourself, that wouldn't project a good image of the kind of people they are looking for. A good GPA is a a step in the door but the way you carry yourself seems to be more important because most of what you'll do you'll be trained to do but a person can't train you to act confident. This might sound cliche but also be aware of your nonverbal communication- they way u sit, your hand movements and all that stuff. People really read into them.
Goodluck. And pray to God, He would not fail you.