No. I study for all of my exams. The only time I never studied was for a few of them in physics in junior year of high school and I failed, as expected.
I went through HS without actually taking a book or studying for a exam
I did spend like three months on my final year preparing for the ICFES, a national exam which is literally the only thing that's taking into consideration when applying to college.
Yes for one of my math classes, I did ZERO home work but literally aced all the tests including the midterm and final. The professor told me that technically my grade should be a C since I only completed half the work, he still gave me an A for getting 100 on all the tests. He told me he knew I knew how to do it so in his eyes the homework was irrelevant. To top it off, he graded on the curve, but I slayed them all so there was no curve.