Student loan repayment question ...
I currently have 4 different loans (groups) ranging from $1800 to $6000

The interest rates are 3.4% to 6%. What would be the best way to pay these off?
Should I go for the lowest loan (it has a 4.5% interest rate)? Or should I go for the highest interest rate?
I am on a income based repayment plan and being single mom with only my income makes my payment zero. I just can't sit and watch the interest stack up.

When I called today they told me I have to pay off the interest on the loan I wanted to make payments on before it would start applying to principal.
I was thinking I would go with the lowest loan amount first because I have a better chance of paying off that interest and making regular payments. Like realistically I could start doing that by the 15th of Jan. However, if it is wiser to go with the higher interest rate one to pay down the loans quicker I can look over my budget again and see if that is doable.
I have a little in savings right now and no emergency fund (yet).
Thank you in advance.