‘The college kicked him out.’ My son failed out of pharmacy school after amassing $126K in student loan debt. Is there any way to pay less?

Question: My son was studying in a pharmacy program and at the end of the last semester, the college kicked him out due to his non-performance in academics. The interest rates are from 8.5%, 5.5% and 4% (average is about 6.5%). Is there any way to reduce the interest rate?
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