I believe it was Aristotle who claimed: An unexamined life is not worth living.
Do you agree with his claim, and are you satisfied with how you have lived your life so far? If not, what would you do differently the next time around?
That's a good one, studying harder! I, too, wish I had studied harder in high school. College would have been much more stimulating for me and lead me further along if I had not had to make up for so much I didn't do in high school.