You can Download GITAM GAT previous years question paper from here-
MATHEMATICS- https://drive.google.com/file/d/0B7WTkS2Aqpw9Q1pFVkxTNVJHa1U/edit
PHYSICS- https://drive.google.com/file/d/0B7WTkS2Aqpw9R21oajRoTVFja00/edit
CHEMISTRY- https://drive.google.com/file/d/0B7WTkS2Aqpw9Q1pFVkxTNVJHa1U/edit
BIOLOGY- https://drive.google.com/file/d/0B7WTkS2Aqpw9S2xNY01RNW5jcXM/edit
You can also practice from GITAM GAT 2018 sample papers released by GITAM University be referring this link-
https://engineering.careers360.com/articles/gitam-gat-sample-papers
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