Do your parents have poor credit too? If not, they can get a Parent PLUS Loan on your behalf or look into another type of private loan. If you have a credit card or checking/savings account with a bank, speak with them about taking out a loan. If you don’t have a credit card, GET ONE. So you can improve your credit. If you have one too many, get into a debt reduction program to help curb your credit score from dropping any lower.
The old fashioned way would also be to work. I am a full time student and hold two part time jobs. Hope that helps!