Based on the information provided, the following students are not eligible for student financial aid:
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Tony: Since he didn't complete high school education, he is likely ineligible for financial aid, as most financial aid programs require a high school diploma or equivalent.
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Gareth: As a Miami resident without a social security number, he would typically be ineligible for federal financial aid, which requires individuals to have a valid social security number.
The other students, Keith and Marshall, would likely be eligible for financial aid based on their academic performance and needs, though eligibility can depend on various factors including specific aid programs and state regulations.