Hello aspirant,

To get a seat in GITAM School of Technology, Hyderabad you have to appear in GITAM GAT which is an online entrance exam conducted by GITAM University, Vishakhapatnam for admission to its UG and PG programmes. Since you want to apply on the basis of your JEE Main score then you have to apply in GITAM University campus of Vishakhapatnam. Admission there is done through GITAM GAT, JEE Main, AP EAMCET, TS EAMCET scores. To get a seat in GITAM University you have to attend the GITAM GAT counselling session and see which branches are you getting as per your JEE Main score. 

You can go through this link and checkout the details regarding GITAM GAT counselling : https://engineering.careers360.com/articles/gitam-gat-counselling

Good Luck !!!!