Autism has so many possible symptoms and associated problems that it's unlikely someone affected checks all the boxes.

One of the first signs I noticed in my childhood was that I was asking myself why everyone treated me differently for no apparent reason, and I would say that is a pretty clear indicator for autism as it stems from neurotypical social interactions being more or less a foreign language, and both sides subconsciously recognize that.

> Mostly he's aggressive, low patience, disobedient AF, requires a ton of attention.

I happened to be friends with someone who'd fit that description, the way he behaved at home with his parents was genuinely crazy. But then turned out shockingly normal years later. Sometimes it really is just a phase I guess.

> We're like very puzzled. It's pretty clear that a psy test will find something behavioral,

> Posting this here, Idk why, I'm kind of clueless about what to do at this stage.

It’s tough, but you already know what you need to do.

https://pmc.ncbi.nlm.nih.gov/articles/PMC8328933/#S20 might be a good starting point here?

I recommend seeing a specialist for a proper diagnosis. It'll be worth it.