The eligibility criteria for the UGC NET examination states, the aspirant need to pass Post graduate course in any stream with 55% marks. For a JRF aspirant, the aspirant must have a age less than 30 years, in order to be eligible for the Junior Research Fellowship.

As you have near about 80% in your PG, then obviously you are eligible for the Environmental Science paper of UGC NET examination.

For more information regarding the UGC NET examination consider the link provided below:

https://competition.careers360.com/exams/ugc-net

I hope this helps. Wish you a great day!