The written test is pretty standard, asking about primal and dual problems, reduced costs, etc of linear programming
Operation Research Interview Questions
563 operation research interview questions shared by candidates
Describe a situation where your leadership was needed and what the outcome was
General Stat (probability), mathematical modeling (LP)
The most stupid questions.
General behavioral questions like the most difficult project you've done so far, tell us about a situation where it was important for you to convince people etc
Mostly checking skillsets based on resume such as software and models I used.
As far as preparation goes, be who you are, be confident and extremely thorough on what you have on your resume. Be well prepared on OOPS and Database questions.
Why would you like to work at EY
Describe your projects or work experience related to the job
There is a computer based test given pertaining to research issues related to doctors in the US.
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