Hello,

Your SC prep rank is provided because IIT board thinks you have shown potential in Advance and you can improve and be eligible for the IIT by next year. Thus, I can confirm that you are only eligible for the preparatory course and no regular courses are applicable for you. JoSAA might be giving you choices to fill but they will NOT be allotted to you as you are not part of the common rank list as such for the admission. You can hope there is a vacant seat in any sc course so that you can get a seat in a preparatory course as they are always subject to availability. All the best for your future.

Thanks