My daughter (the one in the .sig) wrote a paper/proposal, outlining the care requirements and husbandry for three different snake species, and explaining how she proposed to reach them. It worked-she got a corn snake a few months later, and a Ball python later on. Both were actually rescues/rehoming.
I will tell you that the single thing that was the biggest pause for me-and for most parents-tends to be mice. When my daughter started researching, I didn't realize that not only do most snakes do very, very well on frozen mice, but that it's actually recommended. And one reason why our snakes were both adopted as adults vs coming from a breeder was that they were already very established feeders on frozen prey.
Escapes were another concern, so make sure you address that as well, and have a really good idea of what housing is needed to prevent escapes. And that's good husbandry.
Finally, address lifespan. Be aware that getting a corn snake at 12 is likely to mean that you still have a corn snake when you go to college, and that many parents don't want to take on snake care. Both of my DD's snakes came to us for this reason-one came because her owner was looking for a new home before she went to college, the other went to college and came home on weekends to feed the snake for the first year and a half, but when he got the chance to do a student exchange to Costa Rica, the snake came to us.
It doesn't mean you have to necessarily have a complete plan in place-but recognizing that you may need to plan to live off campus, or go closer to home so you can care for your pet is important and shows that you're thinking ahead.
Good luck!
Donna (mom of a snake-obsessed kid).