The EKGs were really easy! One was Normal sinus rhythm and they asked me if I was sure. I told them yes and they said I was the first to get it right! They said other applicants were thinking too hard. Just relax and be honest if you do not know something tell them you wil look it up if you don't know it. I told them I was going to look something up, that i did not know and he said "let me know what you come up with". I looked the topic up and e-mailed the answer to him right away. I had trouble with the ABGs and still got accepted. Make sure you write a thank you note as well. Good luck!