Where to get more technical interview coaching?

Wow, you're already in a more specific coaching program than I knew existed until I read this question! You didn't say, but I'm guessing you might be using this service because you don't have much (or any) prior work accomplishments to cite and will be relying solely on recently-acquired skills, right?

Already having the advice of a current employee sounds great, particularly since I've heard Google's vetting process is a bit different from most places. But you might not need more of the same. Learning additional skills at the last minute for a specific interview probably helps most by improving your confidence. I've found that personality factors like confidence often count just as much in increasing your chances of being hired as technical knowledge does. I've actually gotten hired where I did not already have the technical skills (though admittedly not at Google) because of confidence in my ability to acquire skills quickly, and because they just really liked me.

For most of my career, I've found that three components contribute to landing a job in approximately equal portions. Technical knowledge is one third, prior experience another, and the last one is personal traits like confidence and good communications. So if you don't have experience yet, I'd suggest working on both of the other two equally to fill that gap.

Steven Parker can you specify the personality aspects that are most pertinent for interviews?