Have a look at previous year category wise cutoff for IHM Shimla :-

With your 12479 rank, if you belong to OBC Category you can get seat.

For general, you have no chance.

If you've attended JEE

To know your other best admission possibilities of Institutes & branches in JOSSA & State counseling as per your percentile, You can use JEE Main College Predictor tool given below.

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

Thank You.