Even if you are alloted with a seat in NEET counselling round 1 ,the choice is all yours' that whether you want to enroll youself or not untill and unless you have not occupied the seat.If you are not interested in getting admitted in a college through MCC round 1 counselling,no need to worry about.

You will not be forced to take admission in.

But still if you want,you can go on to the MCC's official site and search about how to quit the round 1 counselling.