Getting above 90% in your 12th boards and a NATA score above 120 gives a very good chance at getting into RVCE. Basically try and aim to get an aggregate above 75%
Example: If you get 90% in your 12th boards and 120 in NATA .. that will be 90/2=45 and 120/4=30…. thus your aggregate is 45+30=75%
Once you get your 12th results make sure you compensate accordingly for your NATA
Good Luck