they are heavily IT and SI in S&C. S&C is more like a pre-sales to the follow-up IT and SI solutions. And depending on which part of the world you are in, I know of quite a lot of S&C leaders who comes ERP or SI background all their life running S&C. If you are really keen to get into strategy consulting, and yes, it's difficult to get into mbb, you might want to try other consulting firms first. check out vault's consulting ranking. If you are happy with IT, then IBM, Accenture or CapGemini could be the options.