I am professionally diagnosed. I took the MMPI as part of my evaluation. I was told my score was something like trying to answer them all right (can't remember what it was called). However, the doctor said there was no concern for mental illnesses based on talking to me.
I had a really hard time answering the questions and had to ask for clarification on a lot of them, until I realized the tester wouldn't help explain them to me. For example, one of the questions was something like "are you satisfied with your sex life". I don't have a sex life, so I wasn't sure if I should automatically check no because of that or check yes because I'm satisfied with not having a sex life. A lot of the questions were like that to me, so I had no idea how to answer. I found the test really frustrating.