Andhra University, Visakhapatnam

No, you don't get any concession. The fee for all the students who get admission through AUEET is 1,65,000 (despite the merit).

You may get any course based on the availability of seats
so please participate in the counselling conducted by AU from June 4th onwards.

Yes, you may have chance of getting any group in AU
so please participate in the counselling conducted by AU from June 4th onwards.

Hello Kushipriya,
First of all, are you sure that that your NATA score will cross 100? Being a national-level test, your rank may be good if you score above 100. Your rank depends on the top score and when it comes to the college, it depends on your counselling process. Please don't keep a single college in your mind and think about various colleges, hoping your NATA score will be good.

https://googleweblight.com/i?u=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&grqid=5DG49bQ0&s=1&hl=en-IN
Here is the college predictor link. You will get to know here which college you will get.
Good luck.

Yes, with the rank of 1002 in AUEET, you will definitely get a seat in the Mechanical branch. Your rank is too good.
On the basis of that, you will get admission. Best of luck for your future and if there's any query, feel free to ask.