I’m usually a “go with your gut” guy and a huge fan of Cal Poly. That said, a couple of things caught my eye.
First, if you want to go to medical school, why does switching to engineering matter? You couldn’t pick a worse major. Engineering is very hard to maintain a high GPA, especially at Cal Poly. Just as bad, there are no free electives in most engineering curricula at CP. Squeezing in all the prerequisites will be hard.
Speaking of hard, Philosophy might be. In the grade distribution sheet linked below, Philosophy is ranked near the bottom in percentage of A/B grades given. It’s probably not because it’s brutally hard, but because classes taken for credit instead of a grade look like they’re lumped with Cs. You might want to call the department though and ask. Just explain your concern. GPA rules all in applying to medical school.
Lastly, diversity. Cal Poly is one of the whiter campuses in the CA public system. It’s not due to the reason most suspect though. The percentage of black and brown students is the same as UCB. It’s that there are far few Asian students. UCSB is one of the most diverse campuses in the nation, far more than CP, UCB or UCLA.
Good luck!
https://www.reddit.com/r/CalPoly/comments/8flq8r/grade_distribution_by_departmentmajor_for_winter/