@deadgirl Read this recent thread, along the lines of yours:
http://talk.qa.collegeconfidential.com/duke-university/2140062-pre-med-gpa-at-duke.html
and then read her “chance me” post:
http://talk.qa.collegeconfidential.com/duke-university/2057610-chance-me-at-duke-rising-senior.html
There are a couple ways to interpret this. My way is that students who worry are the ones that will excel, because they don’t take anything for granted. Now you might think “OMG, this is my competition!”, which would also be reasonable. For self-preservation, you might want to avoid classes that pre-meds take, because they will be gunning for 'A’s. Having said that, I’m sure you will be fine.