Hello Yashwanth Mettu..

Don't worry you can make changes in your bitsat application and change your father name.

Correction window will be open from march 22 to 25th 2019. To make corrections you should log in with your registered account details through correction window and make the changes.

Note: changes can be made only during correction period.

So don't worry and prepare well.

Hope this helps you. All the best.