Beats me, I've been rejected by all 4, along with Microsoft and Netflix :) My only advice would be to take a refresher course on Data structures and algorithms

Beats me, I've been rejected by all 4, along with Microsoft and Netflix :) My only advice would be to take a refresher course on Data structures and algorithms (Coursera, et. al.,) and just practice doing programming problems. I've used Crack the Coding interview and some online coding sites (topcoder, etc.) which has definitely helped improve my interview performance. I'm a lot more confident nowadays, at least :)