I was on the OUAC site recently and I saw that McMaster life science is still open. They have changed the requirements to get in though as in they don't need bio anymore. If it is open can I apply? Would they have lowered the grade average that is needed to get in? Another question is I got accepted to Mac Social Science and I have accepted that offer, so I was wondering if I do apply to the Life Science just to see if I get in and get accepted can I accept that offer over this one. How would I go about doing this? Does anyone have any experience with this?

not sure but I know McMaster looks at all applications separately so you can get more than one offer

If you're already registered as a Mac student, then I don't think you need to apply on OUAC. Email/call/visit the science academic advisors or associate dean (contact info on their website) to see if they can let you switch! I'm not sure whether the academic advisors or the associate dean is the right person, but if you email the wrong person they'll at least direct you to the right one. Allison Sills (the associate dean) replies pretty quickly via email