Hello,
You got 128 in GITAM GAT examination which is very good dear. Your rank in between 2000. That means your rank is good. And GITAM University have three campuses. But Visakhapatnam campus is one of the top campus so there CSE which is core zone in engineering which is full at first. But with this rank you will get CSE in Visakhapatnam campus dear. You can get in 1st counselling otherwise in 2nd counselling for sure. So don't be stressed. You can go for the counselling.
I'll provide you a link below you can check it for more details about the college
https://www.careers360.com/university/gitam-university-visakhapatnam
All the best.
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