Hello

After attending the first round of counselling, if you have not joined any college then you can exit the All India Counselling Process freely. The security deposit will not be forfeited. All the deposited amount will be refunded to you. But, if you join any college in the second round then the amount will not be refunded.

For further details you can check the link below

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