In order to find questions asked for the FIT part in the Spanish offices of BCG, I would recommend going through Glassdoor and evaluating the information written under interviews.
To save you same work, here it is: https://www.glassdoor.com/Interview/Boston-Consulting-Group-Madrid-Interview-Questions-EI_IE3879.0,23_IL.24,30_IM1030.htm
If you want to go the extra mile, I would (1) segment the information per role (2) evaluate frequency of questions.
Good luck :)
I recently completed my applications. In preparation, I had a coaching session with a new coach who worked at BCG until recently. He therefore knows the application process at this company very well and helped me really a lot.
I'm sure he can help you, too. Here is his profile: https://www.preplounge.com/de/profile.php?id=245422.
Kind regards and good luck!
I did my interviews in german speaking countries, if this might be helpful to you as well, you can text me.
Do you need 1st round fit questions or final round ones?