Big 4 is not a great idea for top 15 MBA...my collegue went to Booth and get 5 IB offers last year...It is not TOP mba makes you that offer...Top MBA choose you becasue you can get that offer after two year...it's like a club...Big 4 Audit is still very difficult to get an admission... I would recommand you to get an other acounting alternative, like GE's FMP Big 4 audit is very good if you want an accounting job in a corprate in future...but not an good choice for TOP MBA