This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
Send an email to the email address mentioned in this page. They will send you the application form. Fill that and send that back.
If you meet their criteria they will send you a voucher number. Use this to register for the exam. You will still have to pay the exam fee - $150.