Bain, as other premium consulting company has a tremendously hard recruiting process. To apply in Brazil you need to have studied at one of the top 5 universities. Phase 1 consists of of a GMAT-like test + multiple choice bussiness case test (~40% acceptance). Then there is a group interview that evaluates your capacity to work in group and your "Bain fit", which means the interviewer would personally enjoy working with you (~50% acceptance). For last is the really tough part, which is 3 rounds of doubles interviews with managers and later on with partners (~50% acceptance in each round).