The written math test was difficult. The programming languages test not so. During the CEO's question time, just be prepared to say a little about your programming background. Less is more. He is the CEO and you are one in a group of six (do the time-is-money math).
Sigiloso
I wrote C++ programs for my final college assignment which was a WhizBang simulator. It was hard, but I got it done just in time to receive an "A"