Mechanics and E&M in the same semester will be difficult, but still reasonable. I spent about 20 hours a week on each of those classes at my university, so expect to work hard.
I have no idea how some people here are calling it a light schedule.
Yeah, I was a little surprised to hear people call it light. Those two classes are a pain, and a proofs course on top of that. T_T. People I know warned me not to take them at the same time if I want A's.