You need a minimum of 25% in both the NATA tests. Other than that, the final cutoffs will be decided based on post exam statistics. You will find the following article helpful....
https://engineering.careers360.com/articles/nata
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