I applied online. I interviewed at Strategy& (Londres, Angleterre) in Feb 2019
Interview
Series of online test, then video interview, then final round case studies in the London office for 1 day.
Final round was split into 2 halves, after 2 1v1 case studies, you either get rejected or you proceed to the afternoon stage. after 3 more case studies, including a presentation, you either get rejected or get an offer. on the spot.