Mudd uses their own placement exams for math/physics/chem. In CS, you can take different levels of the intro course depending on background. I'm not sure about bio. Language placement is by exam as well.
Mudders tend to get hired by excellent firms - recruiters include joints like Microsoft and Google. Some recruiting happens out of 'clinic' . Some engineering clinic sponsors : DirectTV, Intel,Los Alamos, Mazda, Grummund,Oracle, Paramount, Sandia, Space Systems/Loral.