You applied for a hodgepodge of companies - BCG has nothing to do with your IT background, for example. Deloitte and Accenture, on the other hand, would have been among the best firms you could aim for. It's a pity you applied without doing your homework.
There are quite a few sites that contain sample resumes for late entrants into consulting - google is your friend.
Beyond that, I'd suggest reading up on what IT consultants do, the skills companies look for (many will clearly state this on their recruitment sites), and then you can figure out how you can add value / how to portray it in your CV. Think initiative, teamwork, leadership etc.
Noone is going to tell you in detail how to get into consulting (not for free anyway), and the reason is that doing research, understanding what the "client" wants and selling your relevant experience are core skills for a consultant - not just tickboxes for an interview.