You must have been a very sincere and disciplined student. :)

In my case, when I was studying, I had all the time in the world. During that time, I did try to learn many things but I didn't go deep or weren't consistent. I mostly wasted times in goofing around. Looking back, the amount of time I wasted during college years has become a biggest pain of my current life when I don't have any skill or time to learn those skills.