how many AIIMS are there in India? what is the minimum rankand score out of 720 ( for both OBC and SCST) should I get to get entrance in AIIMS ?will those collages allow students form all over the country as I am from Karnataka. what will be the fee structure for MBBS?

Hello Aspirant, 
As of now there are around 19 institutions of AIIMS in India and now they have no more their own entrance test for admission to MBBS course and now the admissions are taken on the basis of NEET UG score only. 

It is quite difficult to make any accurate prediction of required marks for any particular college because the cut-off keeps on changing every year depending upon various factors such as :-
*** number of candidates appeared in NEET UG
*** difficulty level of the paper
*** top score for NEET UG
*** total number of seats available for admission and so on.


So if we go through previous years cut-offs then according to that, you have good chances of getting AIIMS only if 
>>>>> you score around 570-580+ out of 720 in NEET UG 2022 being a SC category candidate.
>>>>> you score around 640-650+ out of 720 in NEET UG 2022 being an OBC-NCL category candidate.
>>>>> you score around 530-540+ out of 720 in NEET UG 2022 being a ST category candidate.

You can check out previous year's cut-offs from the link given below :-
https://mcc.nic.in/WebinfoUG/Link/ArchievEventsAll

Note that the above prediction is made on the basis of previous year's cut-off and the cut-offs are bound to change every year depending upon various factors such as the number of candidates appearing in an examination, the number of candidates qualifying an examination, difficulty level of the paper, and so on. 

To have a list of all those colleges which you can get based upon your marks, category, and state you can use NEET College Predictor because it will make you comfortable while choice filling in counselling :-
https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer


If you want to prepare further for NEET UG then to help you in your preparation we have some resources which you can access from the link given below :-
https://learn.careers360.com/knockout-neet-may

I hope this information helps you. 
Good Luck!!