For the first interview, there was both a behavioral and case study component. I cannot disclose details of the case study, but you are somewhat walked through it and asked questions along the way. Be very wary and look at the data carefully - do not jump to conclusions. The behavioral interview was relatively simple and you should really just know why you want the position, why you are interested in ZS in particular, and be ready to reference your previous work experiences.

interview was divided in a pool campus into three rounds basic andt then interview and then hr, it was ok, if you know your stuff like mistake finding, later gestimationa nd finally futre plans, good