ctd.. Also, make sure you do some physics electives in second year, very helpful and fun. You will have a huge advantage when it comes to 3rd year electrical eng subjects, having done 2nd year maths.
Co-op is great, it may seem like a bit of a drag in your first couple of summer placements, but the 6 month placements are usually good - as long as you show them that you're enthusiastic and competent, your bosses will always give you good stuff to do.
The best thing about co-op is that it gives you alot of flexibility. I mentioned before about the different industries ee co-ops go into, and when you combine it with maths you will have no problem getting interviews.
As for me, I'm probably going to end up in the finance industry, eventually doing a phd in maths, although I was offered jobs with 2 of my sponsor companies. tbc..