What are the odds of geting a student loan with a credit score in the 500's and no co signer?

Need to know what are my odds of getting a private college loan with no co signer. If I get a co signer and their score is also in the 500 what's the odds of getting a loan? Also if anyone had this same problem and was able to get loan please let me know what bank it was. What is the best bank to get a loan from with a credit score in the 500s?