Let me preface this by acknowledging that there is no way to talk of this without sounding like a kind of an ass. So, I will just speak frankly from the student's perspective, and you'll have to forgive me.
I was that student. As a child and later as an adult, I repeatedly tested in the "highly advanced" range on Stanford-Binet. I joined MENSA at 7 years old. At 16, I got a near perfect score on the ACT with zero prep, and scored in the 99th percentile on the MAT with little prep.
School was easy, and I was in the gifted program from grade one through high school. Every teacher in every school I've attended was aware of my aptitude, as that kind of thing gets around within a cohort of teachers. In hindsight, I realize that I had a few "butt hurt" teachers in middle and high school who gave me a hard time on a personal level. Most teachers were glad to have a student that absorbed everything they taught though, and I was often a favorite student without being a "pet." It's not like I didn't have anything to learn from these teachers. I was very willing to learn everything I could, and I did. I am still in regular contact with several educators who were key in developing my abilities. They are very dear to me. Anyway, my understanding and pace was just on a different level than other students. My parents never told me I was better than anyone or anything like that. They just wanted me to be challenged to meet my potential. The school system I attended went to great lengths to help me take the best classes, and I got special attention from the gifted ed teachers, AP teachers, and guidance counselors to that end.
In order to not have my reputation precede me with my peers, I sometimes had to dumb myself down to fit in: never be the one to raise my hand, never lead a group project, never do anything that could academically make me look like a know-it-all. I was very conscious of this at a young age. While this was a pain in the ass, I understood it was necessary at the time.
However, most of my true gifts are in the creative arts; music, studio art, graphic design, writing, so my exceptional abilities were very visible in that aspect. I was in many music ensembles, bands, and was in a very popular rock band outside of school.
Word of my official scores never got out to my fellow students, though, thank God. People knew me as a smart guy anyway, however. Other students who were above average could detect my abilities...because of their insecurities, they would subtly try to point out how IQ scores didn't mean anything, and academics didn't really measure intelligence, etc. etc. and every other excuse they could think of to make them feel smarter than me. Statistically, I knew that was highly unlikely.
College was different in that initially, no one cared how smart you were. A few professors constantly behaved as though I was challenging them, and acted very immaturely, if I'm honest. I was trying to learn, but when they saw how quickly I mastered what they were teaching, I was treated as a waste of time. I'm still puzzled by that, ten years later.
If I'm missing anything, I'll edit.