"4. If all else fails, figure out what you can afford to pay each month and just start paying more towards the principle every month than the loan requires. At least this will allow you to pay the loan off sooner and avoid some of that back end interest.
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CLEAR THIS WITH YOUR LENDER! Get it in writing, and record them on the phone, if you can do so. Many lenders, especially the private student loan ones and the 'servicers', will just credit your account, not actually applying the extra payment towards your principle, so that it doesn't reduce your interest owed. If your next month's statement shows a credit or a lesser amount owed, this is what happened.
If you have multiple loans, they will do everything they can to apply the payment towards the loan with the lower rate, to maximize their profit. Really, anticipate that they are going to screw you, so have your proof lined up. write separate checks, and put in the notes section of the check the ID# of the loan it is to be applied to.
ETA: Every lender/servicer will have a special mailing address to mail checks/requests that are...different. "Special processing" or something. Call and find out what it is, then mail the check with the extra amount to there, with a note clearly identifying the loan it is be applied to, with a note that if they don't like those terms, don't cash it. They may still try to screw you, at which point hours of phone harrassment may clear it up, or may not.
If you have multiple loans with varying rates, consolodation will help prevent your lender/servicer from applying extra payments to the loan with the lowest rate. they fairly average the loans according to their respective rates, but the catch is they round up the result to the nearest 1/8, or maybe even 1/4. Do the math and figure how much they would round up, and decide if it's worth it. if your servicer is screwing you on which loan added payments are applied to, it's probably still worth it regardless. if your servicer is doing it's job, then not unless the roundup is zero or near to it.
A variable rate is probably not a good idea. Rates are bottomed out, lock in the lowest you can. I've managed to get mine all the way down to 1.375%. At that rate, it's less than inflation, and not even worth paying down. But to get that, i got a 10-yr repayment, automatic deduction, and rate credit for on-time payments, etc.
DON'T sacrifice your credit score to pay down your loans. This will only hurt the rate you can get them refinanced to.
here's the best site for private student loan consolodation/refi: NOTE: this isusually NOT best if you have government loans. if you have any loan that's a govt loan, there arebetter consolodation options.
http://www.finaid.org/loans/privateconsolidation.phtml