Hello student,

You will be allowed to appear for AIIMS open counseling after taking seat the neet all india quota counseling . You need to withdraw admission post counseling. Open round is for all the seats which left vacant after previous round including surrendered/resigned and cancelled. Also the category seats are converted into general if there is no eligible category candidate.All the eligible candidates are called for this round. All the student who qualify the exams can be eligible for counselling. 

Hope this will be helpful..