<p>My GPA got significantly better with my major classes, because I had the interest and put the time into them. I slacked off more in the large intro classes that were interesting only through the midterm. And, take classes with friends and good professors. A good professor can (but not necessarily will) keep you interested longer, and friends relying on you for study groups also help keep you motivated. In the end, though, my highest grades were in my math and science classes and I had lower grades in my humanities classes, again because I was a math major and that is where my interests truly lie. HTH!</p>