ALLTechZ Solutions Provides GMATTest Center in Chennai at Velachery. ATS's GMAT Exam takes place in multiple test centres in 38 test cities across India. GMAT test (internet Based Test) is offered more than 50 times a year. It should be noted that the tests are not conducted on all dates in every test centres. So students should check whether the tests are available on a particular day on the desired test centre.