Oliver Wyman Interview Question

round 1 - why do you want to change the job? round 2 - SQL queries (CTEs + window functions medium level) + basic data science questions + project round 3 - credit risk modelling take home assignment + technical discussion round 4 - credit risk case study discussion round 5 - absolutely useless round (and they rejected me for no reason here after doing well throughout the process) Whole process took 2-3 months which is unnecessarily long