Google Technical Program Manager interview questions

Applied on Google website in March 2014. Got an email from a recruiter in June asking to set up a date for a technical phone interview with an Engineer. Managed to set a date for the interview about one month later. The interview lasted around 45 min and was very Technical. Got a reply a week later that they will not proceed to the next stage. Recruiter didn't give any specific information about the nature of the interview and didn't mention any specific areas to focus on. Everything was a bit vague and I spent nearly a month studying everything - Data structures, Algorithms, Coding, Systems, Networking etc.