Hi there, 

To be honest, I don't think there is shortcut and 2 days is rather short. 

I'd encourage you to rather see how you can reposition your experience when discussing with the manager. There's not much point in overselling your abilities and then disappointing expectations. Rather see how you'd be able to use your spikes in this engagement while using the project as an opportunity to develop the modelling skills on the side (perhaps owning a smaller side workstream that contains some modelling).

Hello!

I agree, unfortunately two days doesn´t give you that much of an advantage. 

In any case, if you stil want to give it a go, there are million excel courses you can buy online. 

In McK, however, we had an internal platform for knowledge sharing where you had courses and docs. If you have something similar, I guess they will have a crash course on this

Hope it helps!

Cheers, 

Clara