If I was intellectually disabled borderline or mild..  would I have been able to pass my CNA certification? 

My therapist says I seem to have average intelligence by the way I speak. She said I'd have to be average by the way I passed my CNA. I was so worried I got my IEP papers back yesterday. I'm an adult and called and asked for them. I'm 25, I had a feeling I was intellectual disabled. Find out on my papers it was a reading disability, which has been stabilized. In school I was in IEP. I struggled in math and had attention deficit due to my ADD. I was in basically normal classes but a few were lower ended, but I was with other kids that weren't in special education. Some just had a para. In my eval it said i was going the same rate as my peers except a few classes. I'm very good at writing papers and spelling. I just had a hard time with math and reading comprehension.
If I had an intellectual disability wouldn't they have found it by now? The reason they put me in it I was missing school and fell behind. My mom says I'm fine. My therapist says I'm average intelligence due by the way I speak and how I was able to get my CNA.

Am I overthinking this? Wouldn't they have known before 25???
In the hospital, im a CNA and they say how good of a job I do. I do blood sugars and assist patients with daily living tasks. Would a person with borderline or mild intellectual disabilities would they be able to do this? Am I overthinking this?
I want to be normal.. my therapist said it's anxiety. That I'm average intelligence being I was able to pass my CNA test