There is nothing to do to secure the admission and the admission will only be confirmed if you have the marks and merit rank according to the requirements of the college you choose. So ultimately you have to for the counselling rounds for the medical courses as the NEET result has been declared. You have to fill the choices as per the course and college and then the merit list will be generated by the admission committee and then you will have to confirm your admission by reporting to the allotted institute. A link is given below where you can find out the NEET cutoff marks for various govt. college so that you have the idea about chhosing the college.

https://medicine.careers360.com/articles/neet-cut-off-for-government-colleges

Also I would suggest you to use the career360s college predictor app for the better idea about the college admissions.

https://medicine.careers360.com/neet-college-predictor