Dear 

Previous year Cutoffs of these colleges:-

https://collegedunia.com/college/56026-rv-college-of-architecture-rvca-bangalore/admission

https://collegedunia.com/university/56100-cmr-university-cmru-bangalore/cutoff

AND in manipal university minimum criteria is of 80/200 in NATA , you should get atleast 100 marks in order to ensure a seat

you should refer to the following link to check the possibility of getting admission in one of the colleges who consider NATA as the admission criteria for Barch. 

It contains college wise ,category wise cutoff of previous years of various colleges which will help you to predict your chances in getting admission in one of them!

RANK PREDICTOR

https://www.collegedekho.com/exam/nata/rank-predictor

CUTOFF:-

https://collegedunia.com/news/e-271-nata-2015-cutoff

GOOD LUCK!!