What a horrible morning! You think you have learned about something and within two hours you face the reality, almost nothing remained in your mind!!!
Let's try to be positive. In my opinion, exams are not the best way to measure knowledge, but they are a great tool for learning how to learn.
In today's exam I learned that I should memorize concrete things (such as program names) rather than only getting the general idea.
I have also learned that normally we focus more on understanding a topic on our own rather than trying to work on techniques to successfully explain it to others.
After all, that's what we are here for, to learn how to transmit our knowledge, to teach others what we know... I have a lot of work to do in order to get to that point!!!