I did pretty bad in undergrad EM and remember nothing. However, my advisor says that since I'm doing well in my mathematical physics class, and if I get an A, I should directly take the grad EM course to not waste time. However, he acknowledges that I had difficulties with EM in the past, so wouldn't be opposed to me retaking undergrad EM. He also advised me that if I was to take the grad EM course it'll be best for me to work problems over the break to go over my weak points and get ready for the big boys league. We're not using Jackson for the grad EM course; if we were I'm definitely going to retake undergrad EM. Instead we are using "Classical Electromagnetism" by Franklin. I looked at the book and it doesn't seem as brutal as Jackson, so I'm kind of thinking, should I risk it?