How do you have a backup plan for college and career?

Like, I would like to be a doctor and I would like to have a backup job career plan, what do I need to do? Do I need to study more, or go to school longer? Since becoming and doctor is very,very hard. So I don't think I will have time to do a backup job career plan?

My backup would be business/sales and I know nothing about sales, can anyone give me advice on how to study sales?

The best way to do this is to start working while you are still in school, so you will have work experience and something to fall back on if your health career doesn't work out. Most sales jobs are in retail, which means you can start working in high school if you want. Most sales jobs measure your personality, so if you are outgoing and get along with people, you should have no trouble with sales as your backup plan.

work in sales while you go to school, start in retail like the gap or the sun glass hut. Dual major is what a backup means. Or hopefully if you flunk out of med school you'll at least have gotten enough credits to switch to nursing as another way along.