Hello,
I understand your query and I will try to provide you with best answer.
Filling 1 form or more than 1 form depends on the candidate and the scenario can vary from student to student, if someone has a very strong aspiration for a particular institution then he/she will fill only one from which is suitable also.
But if your priority is to get admission and it doesn't make any major impact by the institution then you can fill different forms to secure admission and to increase the probability of your admission.
Hope this helps,
All the best !
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile