Sorry for the long replies. I'm interested in trying to help if you are too. But I'm not trying to over extend here either. Let me know if you want to stop. I know it probably doesn't seem like it but I'm putting probably 20 min in on each of these just trying to cut them down to a "normal" size.. I could literally write a book on this!

A couple things: Idk what your scores are but basically the higher you get on the CAT-Q (2nd test) the higher the score should be on the RAADS-R (1st test). IIRC, the highest score ever formally recorded by someone allistic (not autistic) on the RAADS-R was 64. The other thing is, a lot of people don't know how either that what they're doing is "different" from allistic people, or they don't know they're doing it. For example, I wondered I was autistic for years and did test probably 5-6 times before I met someone autistic that was just like me and it all "clicked". For this reason I would recommend doing the test with someone that was around you when you were very young if you can. I will also give some examples below of some of those things that don't stand out right away if that's not possible.

That said, we have a couple possibilities.

1. You simply may not be autistic. There are conditions that could look similar to autism enough to make you wonder if you are or "show up" on the test but maybe not be very high on it. cPTSD is a common one if you lived in a long-term environment when you were not physically or emotionally safe. This is a strong possibility because given that you have ADHD, there's an extremely high chance you either grew up poor or had some sort of scarcity issues (one or more of love, food, shelter, etc)--this is believed to be the leading cause of ADHD. Remember that an estimated 80% of autistic people have ADHD, but that can be from the fact that life is pretty shit when you're autistic and don't know it! Less likely but possible could also be OCD or even dyslexia, both of which are SO MUCH bigger than people think.

2. (This one happened to me, so I'll bring it up): You may have learned the "right" answers to these so long ago you think it's the real you's opinions. Here's a couple of late diagnosed things a lot of us go through:

• Maybe you know how to make eye contact.. but do you actually like it? Like not that it's useful because you can see how people respond, or that you get treated better, but is it something you genuinely want to do?
• Did you line up your toys as a kid? Did other kids not follow the rules well when you played, and you tried to teach them?
• What's the most important personality trait? Is it authenticity?
• How about special interests? Do you have any hobbies that you're really good at? This is another one that high masking autistic will get wrong sometimes because maybe you don't think you are that special at something. But do you ever watch an public figure/celebrity/expert even maybe do the thing "wrong"? Like if you're a mechanic special interest are you going to be upset that someone didn't look up torque specs, or if you program... and they either built code in a stupid way or formatted it with the wrong bracket style.. these sorts of things. If you even notice this sort of stuff, that's probably not the ADHD.
• Do you feel like you can look right through other people and maybe know more about them than they know about themselves?
• The sentiment: "Why isn't everyone else as blunt as me?"
• Sensory things: like turning down the radio when you go to park. Or clothing tags suck. Or that little nub on the small toe in your sock that always sits wrong. Is polyester the worst? Do you have a specific utensil preference, like only liking the small spoon or a specific heavy steak knife? These are some common "real life" low-support-needs experiences.