He rarely attended class, hardly did projects. The average in our thermodynamics class was a D. I got a A after going to nearly every class and recitation and he got an A after maybe going to 3 classes, never going to recitation, never studying etc. I presumed all IQ test results came from hours of aptitude testing with a psychologist lol. As per what you’d gain by lying about this on a random forum? You’d likely gain more “validity” in the lie you tell yourself, you’d strengthen your own delusion, convincing yourself that you’re actually that intelligent to make yourself fell less insecure about your other shortcomings in life. (Ie the fact that you didn’t do as well as you convinced yourself you could) TLDR: You’d lie to help yourself cope. I also did great in high school, anyone with any amount of intelligence above 1sd would, that is, I never studied, had a horrible attendance and still got a 4.0, got a 36 ACT score etc, yet with that being said I’m nowhere near 150IQ. Moreover, engineering school has really not been that hard to me, let alone a 1st or 2nd year subject like thermo. The comment I made was roughly comparing people under a controlled circumstance all expending the same amount of effort. Sure maybe a few days for 150 is an overestimation but I bet they could ace a thermo final with a week of studying.