Rule 1: Take a Breath
Pushing to graduate early and earn a masters believing that this may impress adcoms is not always the case
1) Many schools are not keen are summer prerequisite coursework
Frequently Asked Questions | College of Medicine | SUNY Upstate Medical University
Applicants should avoid taking more than one or two prerequisite science courses during the summer and avoid taking them at community colleges.
2) Pushing to complete coursework may not leave you sufficient time for volunteering/community service, clinical/healthcare experience, shadowing, research, and other ECs.
3) It also may not leave sufficient time to prepare for MCAT, which is as vital as GPA
4) Working on a masters may not have significant impact on your admissions chances and doing so during application year presents issues. You must leave enough time to work on secondary application as well as travel and interviews with can lead to scheduling problems
5) Lastly, taking a masters does pose a risk in that many medical schools will require that you complete the masters before matriculating. If you doing a masters that requires a thesis or research, it is easy to get delayed and not complete on time
In sum, I am not a fan of students pushing hard on completing the academic side early and losing sight of all the other factors, and time these factors may take, in order to be a successful applicant