I am a Biology major with a chemistry/psychology double minor and my AMCAS has already been verified. I want to drop the psychology minor. Can I do this since my app has already been verified?
Yes but I believe many schools will require you to update them about this pre-interview. Not that it would really hurt your app though, I don't think minors are a big deal.
On my secondaries last year, almost all schools said something along the lines of "you agree to update the Admissions Committee on any changes to your academic standing, graduation plans, or degrees and/or future courses listed here."