When we do testing in schools to determine giftedness it is the top 95th percentile of different tests. It wasn’t just reading and math but also nonverbal tasks (like tangram type things). We used state testing and IQ scores as well. We tried to create a whole profile of a child and then determine which ones met the criteria of requiring gifted services (95th percentile and above). I don’t think there’s a federal guideline so each state (or even each district) sets their own parameters. The twice exceptional kids were the ones with ADHD or other diagnoses. But yes, it was possible that these kids were not the “smart, model student” though I’ve had plenty of those as well.
The only benefit I have seen to kids wearing smartwatches is the ability for mobile payments with their watch for the bookfair or other fundraisers. Phones are not allowed at my school, but wearable tech is. Kids usually don’t care about step counting, sleep tracking, or setting alarms and reminders. Honestly, a kid wearing a watch that doesn’t know how to use it and has an alarm going off every ten minutes is frustrating. As far as communication, I feel like that should be discouraged during the school day. Smartwatches end up being a distraction more than a benefit in most cases. Personally I would be more on board to getting a basic flip phone than a watch for emergencies. If you do get a watch, I would explore different parental control features and “school mode” to see what it offers.