It is challenging to secure a loan of 7.5 lakhs without a co-applicant for a Bachelor's degree in India. Most banks require a co-applicant with a stable income to ensure the repayment of the loan. However, some non-banking financial companies (NBFCs) may offer unsecured loans without a co-applicant, but interest rates may be higher. You may also explore government-backed education loan schemes that provide collateral-free loans, though a co-applicant may still be required. Contact multiple banks and NBFCs to see if any can accommodate your specific situation.