my degree with 71 percent dec mat 13.5 i eligble for that clg

Yes, you are eligible to apply. RIMS gives only 10% weight to the aptitute test score and hence if your overall performance is good you can get a seat in this institute. To apply, Download application form from website, print, fill and send it to the institute.

It is very difficult on this MAT score, But you can contact the institute for admision