Counselling
No, there is no harm in filling so many choices. You will get a college according to your preferences. You should fill lots of college.
If you want help in choice filling you can use below college predictor
http://www.medicine.careers360.com/neet-ug-college-predictor
All the best!!
The Question containing Inaapropriate or Abusive Words
Question lacks the basic details making it difficult to answer
Topic Tagged to the Question are not relevant to Question
Question drives traffic to external sites for promotional or commercial purposes
The Question is not relevant to User
And never miss an important update