*Edit: I checked some of the stuff more out in detail. While some concepts on this are valid and backed up by sience, others like RSD are not. Use this as a springboard for learning, not as a valid source in itself. Yes it says so in the corner already. But spelling it out might help.
People are more complicated then a diagram from the internet. Never forget that.
In Ontario, Canada, if they still do it the same way as they did in the 80s/90s, they do a test in grade 3 which can determine giftedness. After the test I was sent to do a psycho-educational assessment, then sent off to another school with a gifted program. I was in gifted classes until the end of grade 10. I definitely made some great friends in that program, but I think I would have been better off being taught how to survive in the real world, compared to the experience of having your own special class. There is no “special class” in the workplace. Or, you can probably just go directly to a psychologist for a psycho-educational assessment, but there is usually a cost involved.