To tell or not to tell?????

Okay then...work. There have been some changes lately. There is a new position that has opened up, assistant to my boss - deputy team leader if you will, specialist knowledge something or other, I did not pay much attention because I do not have superb knowledge of our processes (a requirement) YET and there are people on my team who are WAY ahead of me in that department. So I was somewhat shocked when I had my one to one today and found that my boss would like me to apply if a certain other person does not. The certain other person has been there for two years and rightly deserves the position but is not sure he wants to take it on. I also got my test results back, and although it was not the 100% I got for my last test (Sanctions) it was a relatively good 78% - and then I found out that my Call Quality Monitoring came in at a whopping 97% - who needs Fridays when so much good news comes on a Thursday!!!