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You can use this site https://engineering.careers360.com/articles/gitam-gat-sample-papers-mock-test provided by careers360 for free downloadable sample papers and mock test.

Given sample papers gives you familiarity with format & pattern with understanding question types and structure. These will improve your speed & helps you in time management, and also let you focus on your preparation by identifying your strengths & weaknesses.

You can also check official GITAM site for past year question papers.