<p>I believe that most majors can be made pretty difficult if you don't plan it right. Personally, I think it is Course 6, because you have a much larger population in the major which you have to fight against to beat that curve!</p>
<p>Oh, and first semester freshman year is definitely not a good approximation of how hard a particular major is going to be. Maybe second semester will be more realistic if you pass out of a lot of introductory classes, for example, getting sophomore standing. Rather, you will start to get a good picture sophomore year. Then you begin to realize why they gave you a credit limit during your freshman year. :P</p>