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 applicant must be registered to take the test by his or her recruiter, and once registered; the applicant has 72 hours to start the exam. Once the exam is started, it must be completed within 24 hours. For the PiCAT scores to be allowed for enlistment purposes, a verification test must also be completed.