['I took a test last week that I had studied very hard for. I know I got most of the answers right, but I got a failing grade.']
Must've been a really difficult exam. Will there be other exams to balance it out?
I did really well on a test last week. I got most of the answers right, but the teacher gave me a failing grade. The person sitting next to me cheated off of my answers, so she failed both of us. It's not fair.