I'm pretty intelligent, and I am always happy with how good I can be, but I CAN, of course, always be better. When I was younger, I always felt I was maybe the best, FOR MY AGE, at what I could do well. I STILL don't know if anyone was better. These days, as an adult, some are clearly better than I am. They studied hard, adopted a hobby, and kept up. I let it slide. Even on COMPUTERS, I let it slide. So I am not THE best, big deal. Still, some may think I am, or think that I think I am.
Frankly, I think the ones that claimed I was a know-it-all were jealous to a degree. I just kind of laughed it off. I never knew everything, or claimed to. I just apologize for knowing something about the subject. I just know a lot about what might seem like everything. I never claimed to know everything about even one thing.
As for SAT scores, some take special classes and learn nearly the whole thing by rote. A person with average ability, but a great memory, could probably score perfectly on them. A very intelligent person that never studied for them may not do nearly as well. One test, ESPECIALLY a standard one that has books written SPECIFICALLY for it, can't determine intelligence.
HECK, scripps even has methods to win the spelling bee! GRANTED, it doesn't seem to be the same thing, but you can spell a LOT of words with information that the judges are REQUIRED to give you. You just need other information scripps gives you. And HEY, scripps may be harder because of all the variants and the fact you don't know which words they might ask. Some SAT courses have been attacked for being too close to the real thing.