Hello Aspirant,

If you completed your Bachelor of Library Science in 2015 and have only gotten a marksheet until now, you will need to only apply to your university for a degree certificate. Here is a way to do it:

1. University Website: Visit the website and check under the "Examination" or "Certificates" sections where you will find the process to apply for the degree certificate.
2. Application Form: Fill in the application form online or offline (dependent on the university).
3. Upload: Most often the combination of your final marksheet, ID proof and payment challan need to be uploaded.
4. Payment: There is usually a small fee (compared to buying other materials/books/supplies), and you can either choose online payment or bank challan.
5. Receipt: After the successful application you may get it by post or have to pick it up from your university.

If you are not sure of the exact process you should contact the examination or certificate department via telephone or email.