If your all the documents have similar father's name I will suggest you contact the principal of your college for the correction in B. Tech mark sheet. He will suggest you for the complete procedure and the nominal fees which are taken by the university for the name correction.
Some universities also provide online facilities for the name correction. You principal will guide you whether online facility for the particular university is available or not. In an online facility, you have to submit an online form with relevant documents like adhaar card, mark sheet of 12 class, photocopy of TC, etc. You have to pay online fees through any digital medium.
In offline mode, your principal will provide you with a form. You have to fill up the form and submit the form along with relevant documents and challan for the fees.
After that, your principal will forward your application to the university and you will be provided with a new corrected mark sheet.
Honesty is the best policy.