I guess you were just "lucky" the prof was so forgiving with the curve.When I was in college I took a calc 3 exam. I studied for thirty hours that week and when I got to the test I could only answer 4 of the 12 questions. I guessed on the rest of the exam ended and ended up getting 8 right, with the curve I got an A on that test. It wasn't luck that I passed that exam but it was luck I got an A.