[karim]

Here's one way to see things – there's around 3.6M software engineers in the US. Google has 100k employees, so let's assume they have 50k engineers. Do you think the top 1% of engineers in the US all work at Google?

Obviously they don't. The truth is, there's no perfect interview process, and chances are you may fail (or succeed) for reasons completely out of your control. You've been studying for a month, and have a degree from a great school – what else can you do to improve your chances? Relax, accept that interviews are a crapshoot and try doing your best.

Worst case you won't get an offer but guess what? Plenty of great engineers got passed by Google or Facebook.

[croo]

I second this. Do your best and know that you will be a better programmer because of the one month study and the experience of the interview.