Nan Saw The Letter!

At least once in my life, someone has told me something about themselves that I feel they’re trying to convince me of believing rather than simply having a normal conversation. Has that happened to you? For me, it’s like hearing the phrase, "I swear I'm telling the truth!" after every word they say. That's how I ALWAYS feel when it comes to my mother. And now, I honestly doubt the validity of everything she tells me.
Take the information sent to me in this letter. 100%? In the whole city? In history? Besides, Nan is 91 years old! She can hardly see anything...

NYCERS=New York City Employee's Retirement System

Just want you to know, if anything happens to me, this is the place you call as you are listed as my beneficiary in the event of my demise and you continue to collect $200 a month.
Mom
(over)
Did you know I was the only one in the history of New York City that ever placed 100% on the civil service exam for social workers? I have the letter they sent me to that effect!
Nan saw the letter!