Is it possible for my sister, who is working in a company, to be a co-applicant or sponsor for my education loan?

Yes, your sister can be a co-applicant for your education loan if she meets certain criteria.

Most Indian lenders accept siblings as co-applicants, provided your sister:
- Is an Indian citizen
- Has a stable income (from salaried or self-employed work)
- Has a good credit score
- Is typically between 21 and 60 years old

Some lenders may have additional or specific policies about siblings as co-applicants. It's best to check directly with your chosen bank or financial institution for their exact requirements.