Am I slow or dumb?

So in school I did get extra time for test and get broken up into smaller groups in my earlier years of school. I dint ride the short bus but still I don’t think stuff like getting some extra time made you dumb but slow in almost a literal sense.

But I think even for the quote on quote slow classes I was in I was advanced I remember and incident at the start of middle school or actually in my second year I was in all regular classes which was fine but my grades dropped dramatically I had a death in the family and put zero effort into my school work didn’t do anything of the work at all eventually the school counselor said they were moving me back into special classes but by this time I’d started doing my work again and my teachers even vouched for me that they started seeing improvement in class but I got moved anyway.

Anyway since graduating I haven’t used majority of the stuff I’d learned in school but I almost feel like not being in school has made me really dumb. I make simple mistakes that I shouldn’t be making over and over again and I know the people around me have to think I’m a little slow the new nice way of saying you are slow or dumb.

It’s honestly frustrating I want a way to help keep my mind sharp academically on my own time. Reading is one thing I plan to start doing is there anything else I can do?
Am I slow or dumb?
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