Interview process is generally three rounds with one of the rounds being a case study, if you prepare this properly and deliver it in a concise way you should get through fine. I've seen many people carry on for too long and not articulate well so do a practice run to help you get through it well.

Came at me like it was super urgent and they were super keen, almost hot and heavy, then left me waiting in a holding pattern. Seems surprised that I thought it was a long time between communication from them.