Hi Balamurugan,

As you mentioned your JEE Mains 2019 score 81.755 so you are qualified JEE Mains exam admission as per previous year cutoff for JEE Mains. The previous year cutoff for JEE Mains as follows:

Category      Min Score

General            74

OBC                 45

SC                    29

ST                     24

PWD                -35

Also you have good score in 12th board exam so you are eligible for JEE Mains exam admission. The minimum marks required for JEE Mains exam for board is 75% marks for general category and 65% for ST & SC category respectively.

Hope you get this !!