Congrats on the interview!
If you want to deep dive on Behavioural (and not only, coz when they say behavioral they mean fit in general) , the "Integrated FIT guide for MBB" has been recently published in PrepLounge´s shop (https://www.preplounge.com/en/shop/tests-2/integrated-fit-guide-for-mbb-34)
It provides an end-to-end preparation for all three MBB interviews, tackling each firms particularities and combining key concepts review and a hands-on methodology. Following the book, the candidate will prepare his/her stories by practicing with over 50 real questions and leveraging special frameworks and worksheets that guide step-by-step, developed by the author and her experience as a Master in Management professor and coach. Finally, as further guidance, the guide encompasses over 20 examples from real candidates.
Furthermore, you can find 3 FREE Expert Articles on PreLounge, in a sreies dedicated to preparing for the different parts of FIT:
Feel free to PM me for disccount codes for the Integrated FIT Guide, since we still have some left from the launch
Hope it helps!