Talk to the schools financial aid office. The question is from what date you gave to evidence permanent residence.
Due to the nature of this forum, I often do not have all the information required to provide legal advice. Accordingly, my responses on Avvo are intended as general and not legal advice.
For FAFSA, if not a citizen, you need to be an eligible noncitizen: a resident; refugee; Asylum recipient; certain type of parolee; Cuban-Haitian Entrant; or a citizen of Palau/Marshall Islands/Micronesia. You may also want to speak to an attorney about whether an expedite request in your immigration case is possible.
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Though it is not an immigration law question, you are not qualified.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.