Hello Aspirant, hope you are doing good.

So, The preparatory rank in JEE advance, even for SC category, is not really an actual rank. It's basically a rank for preparatory courses. This means, the vacant seats in IITs that are not occupied by anyone after counselling, are given to some other students, who get a year to prepare in IITs. They, then appear for an examination the next year, and based on that their seat is confirmed in the respective IITs. So, i don't think that preparatory ranks are accepted in any counselling.

If you want to know about all the colleges that you can get into with your JEE Advance rank, you can find it here:

https://engineering.careers360.com/jee-advanced-college-predictor?icn=QnA&ici=qna_answer

Hope this helps you. Good Luck!