The P after your rank indicates that the seat you have been allotted is not an ordinary seat but is a Preparatory seat. preparatory seat means that you have been given the admission into IITs on a provisional basis, and in the following next year you'll be trained by some IIT to be suitable for the B.Tech courses offered by them, depending on the fact that how good you do in the preparatory batch.

You can also use our college predictor to see your chances in all the colleges:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope I have answered your question. All the best!