Not at all,you just need to attach affidavit for the mistake of names in your father's documents which is a legal document can be made by any lawyer for 100 rupees.at the time of counselling process most of them are very helpful and they will let you know the process of this which is so simple.

Focus on preparing the exam rather than this thing its not a big problem.you can ask your fellow too if you have still doubt.

All the best..