My spouse is an international student...

and I am an citizen of US. We are currently in the process of filing and sending our paper works. What happens if my spouse drop college?

-money

-classes unavailable for his major

I know he will go out of status. Anything else?

Also, after he gets approved / green card, can he go back to school?

If he can, does it mean he’ll have to start all over again?

If he cannot, please let me know the reasons?