Medical scientists usually need a doctorate degree in biological science. Some medical scientists have medical degrees. Medical scientists typically complete courses in biology, chemistry, physics, engineering, mathematics, and computer science.
Status: Medical Student (Accepted) AMCAS states that it usually takes ~4-6 weeks for verification to go through, but looking at the verification trend right now here: http://forums.studentdoctor.net/threads/2014-2015-verification-thread.1076112/ I would say you're looking at 3-4 weeks from the time of submission.
The AMCAS primary application opens in the beginning of May and can be submitted in the beginning of June. Verification and processing of your application can take a while, especially as things pick up in late June and early July, so getting on the ball early can help you throughout your medical school application process.