Hello, hope you are doing well!
Your final merit scores will be your NATA scores divided by 2, then the 12th percentage added with it and finally then whole number divided by 2 again. {(147/2+89.4)/2}= 81.45 is your final merit score.
You can use Careers360's college predictor for JEE Main Architecture 2020-
https://engineering.careers360.com/jee-main-architecture-college-predictor?ici=cp-listing_engineering&icn=JEE-Main-Architecture-College-Predictor
Application | Eligibility | Exam Pattern | Admit Card | Answer Key | Result | Cutoff | Accepting Colleges
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile