Apply for the loan again, preferably with a co-applicant who has a good credit score. To secure a loan, you can offer some kind of property or fixed deposits.
There are various government-run education loan schemes available for your consideration. Among other things, you might explore the Padho Pardesh Scheme, the Vidhya Lakshmi portal, and the CSIS system. These are government-managed projects. Review the qualifying requirements of every program and make appropriate decisions.