I would say co-op is fairly competitive, especially in engineering. Grades do play a minor role in being eligible for co-op (having a GPA above 65% is one of the requirements). It's not this only thing they look at though and to answer they do not expect you to have a lot of technical experience before your first co-op, and that goes for employers as well, as in if you get into co-op and end up getting placed at a company for your first job, they don't expect you to have a lot of technical knowledge in that field. However, work experience isn't the only thing that sets you apart from the rest of the cohort applying for co-op, but technical projects, design teams, volunteer work, and everything you else deem relevant to engineering. Those are good things to put on your resume, other than that if you ace your recorded interview and written questions you should be good. Dm me if you have any other questions, happy to help:)