Well, I was in your same boat a couple of years ago. People think you are crazy but the more focus you have the easier it is for you.
In HS, I'd recommend taking the following APs - Calculus, chem, physics, stats, maybe us history, econ, etc.
The Calc can get you through both semesters in college so you never have to take a math class again after highschool! Same with physics, physics b will be just fine. As far as the chem AP, don't take the credit in colelge but it helps you enormously vs the kids taking a college level chem class for the first time. English APs are kind of useless unless a local college will give you good credit for them. My state college only gave one semester of an easy freshman writing seminar's credit.
Choose a good undergrad school. Don't pick the most expensive private college you get into. You can even go to a CC and jump to a regular school in 2 years. My reccomendation is to go to a state school with good relations with the local state dental school. Your GPA is critical, the school you came from not so much. I am in a small liberal arts college in NYS that has recently been producing insane amounts of dental, medical, and vet students for our size.
Look into 7 year programs. This allows you to shave an extra year off the process and save the hassle of applying to dental school and doing the interviews. They still interview you, but expect a lot less serious answers from a hs senior than a college junior.
And have fun. My 7 year program requires me to have # shadowing hours, certain GPA, and DAT and thats it. I don't really do too many ECs in college, just enjoy life. Drink, lift, and enjoy the endless coed fun is basically what I do here.
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