Hello,
These are some of the must have rule/tips to follow while filling choice in NEET counselling and they are:

• Choice Filling:Fill choices according to what you want not based upon past years closing rank that you can get.

• Number of Choices: Fill as much choice as possible,but dont fill those colleges in remote areas to which you dont want to go in future.

• Order:Fill choices in order of your preference.

• Documents:As soon as seat is allotted to you make sure that you are strong on document side.

Note : Option 1 is the most important,So focus on that.

For further information please go through the link given below :

https://medicine.careers360.com/articles/neet-counselling

I hope this would help you. For further queries please feel free to write me down in the comment box.