[36bydesign]

You also might be remembering your skills inaccurately. In jr high and high school I also got top grades easily and rarely studied. In college I finally had to. I wondered where my ease of learning had gone, but eventually realized the most likely explanation was that the material had simply been much easier/more intuitive and that I was tricking myself with selection bias.

[iopq]

I'm not the same person, but I never studied in college either. I would go to lecture and get 90%+ on the exam. I would get Bs and Cs because I would never do any homework. I could use concepts from math classes without having used them before, as long as they were explained in lecture.