Booz Allen Hamilton interview questions

First round was a phone screen interview with HR. Second round was a 1.5 hour of interview. One 30m casual interview with questions about interest and so on. One 30m interview with technical questions and one 30m interview with another person on more questions about technical stuff and interests. I didnt know it was going to be 3 30m interviews back to back. The invitation email only said 30m so that was deceiving. I got nervous on the technical skills part.