Step by step instructions to become a surgeon or pediatrician...?

You don't need to go to the same school for college and med school, most people will not. In high school, take all the math and lab science (bio, chem, physics) cles that you can. In college, major in whatever you want and take the premed cles in bio, chem, physics and math. Keep your GPA above a 3.5 (well above if possible) and do really well on the MCATs. Then you've got 4 years of medical school and at least 3 years of residency.