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I know that we can update our FAFSA application, but how does it work? Say, I initially listed 10 schools, then 2 of them rejected me, and I want to replace these two with another 2 likely schools. In this case, do I have to update with the original 8 + the new 2, or just the new 2, or even a new 10 schools to make it a total of 20 as my options?

My question is really this: does the later update remove the previous ones? Is it a "replace" or "additional" relationship? Anybody knows the answer? Thanks.

You just edit the FAFSA through fafsa.ed.gov- you don't have to notify each school.