There’s not much I can add that hasn’t already been said. Hopefully the college courses he’s already taken have been all As as their GPA will count toward his med school GPA, both for science and overall (not APs, just any actual college courses).
Med schools are extremely competitive to get into. Being young is not a plus. Any particular name of a school on a diploma is not a plus. Having a high GPA and MCAT is almost a must. Having a ton of hours shadowing and volunteering is a must. Having other ECs is a must. Med schools tend to not like to see cc classes and if they allow them, it’s often for those who decided later in their lives that they want to go to med school - not those starting out with med school in mind.
What med schools say they have for minimum requirements is not what I would have on my app when so few even make it to the interview stage.
Read this profile of one med school’s students - then google for other years if you want to compare. They aren’t the only med school looking for kids who have done so much and kept high grades.
If med school is certain, consider cheap to help with med school expenses later and expect to take higher level courses to counter all of the “completed in high school” pre-req classes, then work to become someone his med school can write about.
If money is not an issue - no raiding retirement, mortgaging houses, or high loans, then pick the place he likes the best because students who like where they are and what they are doing often also do the best.