You are smart to be considering your options and chances at some very selective schools.
Cornell’s overall admission stats show SAT Math 25/75 ~680/780, whereas Engineering specific admit range is ~740/800. It doesn’t mean that you won’t get accepted, but your chances are lower with a 730. Of course bio is also a very popular major for pre-meds, so admissions is also very selective. You do not have to be a bio major to be pre-med. You can be any major as long as you take all the pre-med requirements. At Cornell you can choose the Ag school for bio and other science majors (doesn’t have to be Arts&Sciences) - but your gen-ed requirements will be somewhat different, so you should see which you prefer.
There are many schools that offer eng/bioeng where your stats will be very competitive. Just be sure to have some match and safety schools on your list.