Investment Banking Interview Prep

I need some advice from the people who have been through IB interviews specifically those who had less time to prep (even if you had enough time, I'd like your opinion).

I might get an opportunity to interview for an IB role and if I do, the interview will be in a month (as per the off-cycle timeline). For context, I'm already working at this bank and I can express my interest to the recruiter who can then get me an interview within IB. The problem is, I'm not sure if 1 month is enough to prep for an IB interview and if it is, how much time should I dedicate daily/weekly? 
As for my technical knowledge, I can comfortably answer the basic questions from each module in the BIWS 400 (my basic concepts are quite clear). For the behaviourals, I think I just need to keep doing mocks to refine my delivery as well as prep for "why IB?" (basically my story).

Would really appreciate any advice. Thank you so much!

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