will it update when i submit fafsa and css or do i need to email them?
I can’t speak for MIT specifically, but every school we dealt with updated their proletariat as the received the information. I’m sure they are no different. If after submitting (and giving them some time to update) it still doesn’t reflect correctly then you should contact them.
Did the application ask:
“Will you apply for/ or need financial aid?”
Some school applications ask at the time of application.