I see a lot of people have difficulties depending on the professor. I discovered
this site
http://www.ratemyprofessors.com/index.jsp they have reviews for almost every single professor in America. You can see if their hard or easy, speak good english or not, how they grade and much more.
If I were to go back to school I would never pick a professor blindly again without reading reviews first. That site is kinda popular, a lot of the teachers I had are in there and have reviews.
its free too, just select ur state and go from there