I'm currently prepping for the Fall 2018 interviews at MBB/Tier2 firms. I think I'm a strong candidate: I finished top of my programmes at target schools, have strong leadership and management examples, and have a large range of competitive extracurricular activities & foreign languages. My CV was screened by ex-MBB partners and deemed to be excellent. I am preparing quite thoroughly and I feel that I could really contribute to a firm as a consultant.
However, I have issues with feeling and appearing confident and believe that they might cause me to miss out on offers; I have previously done final rounds at the Big4 and systematically panicked when asked whether I was certain of my answers (they were correct, but I still spent minutes looking for a mistake).
I definitely don't want to lose out on opportunities because I don't appear confident, and so I was wondering if you had tips - apart from practice - on appearing confident at interviews.
PS: I am not interested in answers of the type "JUST BE IT" - but concrete tips to build confidence and not lose ground in front of interviewers (strong eye contact? speaking loudly? You tell me!)