Hello aspirant

With 85 percentile your expected all India rank will be around 130351.5

As you are from St category, you are qualified in jee main. Previous year's cut off for qualifying Jee main was 44+ percentile for St category. Though your Jee main according to your category is good but as you have mentioned that you got less marks in your xii board  . You have not mentioned your xii board marks. Seeing to your category, for BE /B tech courses you should get minimum 40% in PCM in xii board. For admission to  NIT and IIT Colleges you should score minimum 65% in PCM ( it is 75% for general category)

On basis of Eligibility. Criteria for different courses you can estimate whether you will get admission to MBM or RTU KOTA.

However if you are eligible then Admission will depend on but offs of these colleges. Cut off varies each year. So after jee main July session you can follow the link given below for college prediction

https:// engineering.careers360/jee-main-college-predictor