It's worth it to study and go extra mile for the higher honors. Study! Study! And drop a class with a bad professor if necessary and then you can get a administrative withdrawal that doesn't adversely impact your grades. I thought my grades were reasonable at 3.5GPA towards end of my undergrad career when I was getting ready for law school. However, had I went the extra mile, studied harder and not slacked off, it could have made difference between getting 3/4 to full tuition scholarship for graduate/professional studies or not much of anything but a pittance $3,000 scholarship which is what I got. Study hard. Remember school doesn't last forever no matter how tedious, trifling and time-consuming it may seem at the time.
Scott is on the right track.