NEET admission is not that way. Admission process will start after the counselling process. And you just have to list down the names of colleges as per your priority list and on the basis of your merit score and as per your list, you get allotted with colleges. And then you can either freeze that college if you are happy or keep yourself open for the next mop up rounds.

Refer to the website below for more detailed information...

https://medicine.careers360.com/articles/how-fill-neet-application-form

https://medicine.careers360.com/articles/neet-application-form

Best wishes.