Basically it depends on your state and your district.For Army GD, you have to fill a form of Army GD on Join Indian Army , Army publish a notification of Ground duty rally state wise. And you have to participate in Rally. There are so many posts in Army Rally like GD, CLERK, TRADES MAN, TECHNICAL. Fill your choice in form. They will inform you for your physical exam date according to district. Physical exam for Army Rally is very tough. Thousands of candidates takes part in rally but few candidates get selected.Than medical exam.After physical and medical exam you have to appear in written exam.Than again medical.Than final listThan short medical.Than training call letter.NOTE: YOU HAVE TO FILL A FORM ON Join Indian Army FOR PARTICIPATION IN RALLY.