PwC Assurance Associate interview questions

I got the invitation for a group interview in assessment center. there was around 12 candidates who were seperated as two groups. 2 HR recuiters sitting at each end of the table to observe each candidate's performance and take notes. The two groups then started connected thinking problems and made presentations based on given case materials. Each one had a chance to give a short presentation in front. Then 1-1 interview began. Each candidate was asked to have a 10-20 minutes interview with manager and was asked about their backgrouds and some behavioral questions. 2 weeks later I received a second interview invitation for a partner interview. The total time only cost me 10 minutes, just casual chat. Then at the same day I got the offer.