Am I slow or what?

I had an IEP in school for math and reading, and I think I'm slow. I missed a lot of school, though, like a lot. I excelled in writing and English, but that was it. I'm worried I'm slow.

But I got my CNA license (certified nursing assistant). My therapist said I'd have to be average or above average to pass it. Is this true? I am worried I have a low IQ or slow. But she said I would have to be of average or above average on intelligence to pass.
I do have ADD and get distracted a lot and did in school. I didn't take an interest in school that much.

Was my therapist correct?
Am I slow or what?
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