The main factor of eligibility is your financial need. The information for making that evaluation comes from the Free Application for Federal Student Aid (FAFSA).
In order to be eligible for Title IV federal student aid, a person must meet the following criteria:
Be enrolled as a regular student in an eligible program (with few exceptions). A regular student is someone who is enrolled in an eligible institution for the purpose of obtaining a degree or certificate offered by the school. A student qualifies to study at the postsecondary level if they have a high school diploma, a GED, completed home schooling at the secondary level, or passed a DOE-approved ability-to-benefit test.
Be a United States citizen or eligible non-citizen.
Not be in default on an FSA loan or owe an overpayment on any FSA grant for which proper repayment arrangements have not already been made.
Be registered with the Selective Service System (if male) (with rare exceptions).
In addition, a student must make and continue to make satisfactory academic progress (SAP) as defined by the program itself. SAP must be maintained throughout the length of the program in order to continue to receive FSA funds.