Want to add a few things. Co-ops are usually 6 months (either Jan-June or July-Dec) so you will be working 1/2 a summer for each co-op you take (even if you don’t take summer classes - you won’t have the full summer off)… You do need to do some planning to do a plus 1 program. During what is your senior year (year 4 or 5 depending upon the number of co-ops etc.) you need to take graduate classes. So you can’t be on co-op that year (some people do co-op fall of their senior year). I think you need to have/maintain a certain GPA to be in a plus 1 program. Also, not every major has a plus one that lines up well - many of the joint majors don’t work well with plus one programs.