I was prepared but froze when the interviewer asked me about personal question. Plus, the fact that the interviewer face looked like he/she didn't want to be there (very cold facial expressions with little to no interest) made me feel nervous and didn't enjoy my IV process as much. For the case study, I wasn't as prepared as much so I was having a great difficult time when answering. I guess if any candidate really channel thier time and effort to practice at given resources, they will surely excel the case study part.