Hello

First of all there's no state quota for admission in Aiims , All the AIIMS will provide admissions through all India quota only.

Now , it is the first time ever when AIIMS are conducting admission through neet  examination so predicting cut off marks is quite difficult for Aiims Rishikesh or any other Aiims

Also,

cut off marks will depend upon various factors like kind of marks obtained by students in the examination , toughness level of the neet examination etc and AIIMS will be providing admission through all India quota for which cutoff marks goes high

keeping these things in mind you should target  625 marks at least in your neet examination if you want to get a seat in Aiims Rishikesh if you belong to sc category

Thank you