It is great to hear, that you have found consulting for yourself. Besides the obvious of all the best practices on the site :), here some pointers:
- Connect with anyone in your alumni network currently at MBB and try to have a conversation
- Fully know that you will reach your goals, and that you can succeed, but widen your pool, so for example ensure in that case that you apply to all MBBs and ideally tier 2, too so that you have choices to make and are not reliant on one application - it takes a lot of pressure off interviewing, if you know you have multiple options and it does not have to absolutely work in one particular interview
- besides the first point try to connect with the MBB firms, use any official events they offer, or meet them at careers fairs. If you don't find enough contacts in the alumni network, then network more broadly to find individuals who currently work there. It helps for example to be able to say in interviews that you have spoken to people who work there so you can make informed comments about firm culture, why you know you will like to work there
- perfect your personal fit part in the applications and then in interviewing, put a bit more effort into it than you otherwise would in particular work out why you would be a great fit, maybe there are points in your experience that you can easily point out that make you unique or interesting etc.
Best regards