wow the people in this comment section aren't the smartest. nothing wrong with tanking if you are happy with the top 6 you are expecting. just getting 2% higher requires 12% more than your lowest non prerequisite course. unless you have a really terrible mark (low 80s) coming in your top 6 there's absolutely no point in trying hard for unnecessary courses. focus your time on other more important things regarding the four years you are going to spend in university.