help?

Would I be able to be a CNA if I was borderline intellectual disabled? I've only been diagnosed with ADD, but I have social anxiety. I feel like I'm slow but my therapist said it's anxiety, I work in the hospital as a CNA. I surprisingly passed my CNA, but am I dumb? My therapist said I wouldn't have been able to pass my CNA if I was intellectually disabled. Is this true? She says its just anxiety, but I was in special education in school due to missing a lot of school. I did do a few IQ Mensa tests and got 90 to 102.

I feel like I'm corrected a lot, offline and real life. Idk if I allow it? How can I be more strict about my boundaries
 I've gotten a lot better about it than I was. I'm quiet so people feel the need to push me around? But idk maybe I'm overthinking it. I just feel so dumb, and I get stand corrected a lot. It upsets me cause I want to be smart. :( I don't know if I have borderline intellectual problem or if it's mild? But would I have been able to pass my CNA if I had an intellectual issue? Idk. Please help!! Is this due to lack of confidence?