@WaxesPoetic also can't see your CV but I agree with @anxiousss . I'm not too sure how med school ratings work, but it seems that the NSERC in the BSc Chem/Biomed would definitely still add to your resume. It may seem unethical, but it is possible that you can change your mind in the case you hear back from UofT with an acceptance. It really isn't enough time to make an "informed" decision, so I'd say take the BSc option because it may also be possible that you don't get into MPH just yet. In the meantime, you'd be making/saving money with the RA position, and will show on your resume (for when you do apply to med school) that you've been committed to your research on aerogel. I'm sure a double degree will also look great to med schools? Hope that helps, and whatever you choose, I hope the path & effort pays off!