Initial 3 stages mostly behavioural questions to assess the suitability. Then you end up giving interview to hr then managers. Present a case study to the panel. They test your general approach towards problem solving.
Mostly behavioral questions. I wouldn't say you need to prep for anything specific, just your normal interview prep. What you want, why you want it, how you handle conflict, how you grow, etc
Interview questions [1]
Question 1
Favorite class project, what did you lear, what would you change.
One-way interview then a recruiter call. This was followed up with an HR interview and a series of panel interviews. This ended with a case interview in front of a panel of potential bosses.