I am doing the process with McKinsey. I took the Imbellus test a week ago. I received two emails, the first one from Mckinsey recruiting saying "In preparation for the next stage of your recruiting process" and another one from one of the hr saying "As a current candidate in McKinsey's interview process, I would like to invite you to attend a WebEx training session on case interviewing..."
(editiert)
Thank you Clara, I updated the description in the question