Hello, I'm a high school senior and I have this interest in becoming a doctor.
Q: What kind of GPA would I need to get in Medical school?
It depends on the medical school. Check the MSAR for each school's average admitted GPA. Usually, 3.5 is a good starting point. Anything above that only helps.
Q: What would increase my odds of getting into Medical school?
Almost anything can help, as long as it shows committment and responsibility. Everything from athletics to part-time jobs can be beneficial. I have classmates you worked as EMTs part-time, which definitely helped them get in. I also have some who traveled abroad and used the experience to explore another culture, which helps in some respects, too. As long as you can explain why the experience or activity was important to you, it should be fine.
Of course, there are always the core "GPA, MCAT, and extracurriculars" as the holy trinity of important things on your application.
Q: When the best time to start studying for the MCAT?
It depends. You need to find a personal balance between starting soon enough to give yourself time, and not starting so soon that you burn out before the exam. I started in August of the year I took the MCAT, and the actual exam was in April. I would commit maybe an hour or two per day to studying from the ExamKrackers books series, and started taking one practice exam per week in February.
Q: Should a double major?
Only if you can maintain a 3.5+ GPA. If you double major, but your GPA is under that mark, it won't really impress anybody. It will just look like you tend to take on more than you can chew.
Q: How much should I work doing college and Med school?
Thanks for your time.
Curing college, as much as you can handle without hurting your grades. In medical school, you shouldn't work at all. Your job during medical school is to study. Period.