Why even consider getting a GED if you are already in highschool? ... Because that makes complete sense. That diploma matters more than you think.

You're an idiot if you do.

How would you even expect to open a business, do you know the complications behind owning anything that provides a service/product to consumers?

I doubt you even know how to start a "legal business in you're region" 

Go to school, learn you're shit, and don't be another bum using taxpayers money for welfare. 

You're on your last year, don't let those 12 years go to a waste for some bullshit a bad school held against you. Pull through it for the rest of the year then you're done with school for the rest of your life if you chose.