Social Security Questions? Ask a Social Security Expert
If that is social security disability income - and that is your ONLY income - none is taxable and generally - you are NOT required to file the tax return.Yes - you may apply for the student financial aid and might qualify for government subsidized student loan.Here is where you need to start application
https://fafsa.ed.gov/If you have difficulties - you may communicate with the counselor in the school you are planning to attend.
In additional - if you defaulted on the student loan - your social security disability income may be levied.However - if may inform the student loan administrator and either negotiate the payment plan OR you may apply for the student loan to be discharges.That is possible if you are disabled.