Procurement Consulting Interview- Round 3- Excel & Analytics

Hi Experts,

After clearing two rounds of case interviews & technical experience, I have a third round F2F interview at one of the MBB's for a procurement consulting role, the interview is on this coming friday and will be based on excel skills- spend management & analytics, supplier risk & compliance assessment, quantifying savings, dashboarding etc., 
Is there any kind of service/ guidance which you could provide to help me work on these aspects, especially for excel, that hasn't been my strength as a procurement professional, the overabundance of resources available online- YT videos, website etc is just very overwhelming and not able to understand where to narrow down my focus and sharpen which aspects? I have tonight's time+ tomorrow's entire day.
Looking forward to your response.

Best,
Pratham