Confusion over varying results IQ tests/what IQ actually means in terms of ability? (ASD)
I'm 28 years old now, and I was diagnosed late with autism (ASD 1) at age 21. I'm grateful for the diagnosis because getting diagnosed let me find resources to help me communicate better/understand the social world better, but I'm also confused - because I recently took an official IQ test that placed me at 135. When I was in kindergarten, I was IQ tested for learning disabilities because I only spoke at home and refused to speak at school, and in kindergarten, when they finally convinced me to participate in the test, my IQ came out at 143. I was not identified as autistic at that time, despite what were in hindsight pretty obvious signs. As an adult I'm testing as 135 not 143.
I don't care so much about whether or not I'm smart, I just don't understand the advancements in IQ that have been made in the past two decades and why there's such a huge difference in the numbers.