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You can only consolidate federal loans with the Direct Loan program and I am assuming yours are private.
So many of the private lenders have left the private student loan lending industry, so consolidating your loan with another company can be difficult. To achieve any benefit in consolidating your private loans, your credit basically has to be better than what it was when you borrowed to get any better interest rate. Also most lenders charge origination fees which can negate any interest savings.