All India Trade Tests (AITT) for trade apprentices are conducted by National Council of Vocational Training (NCVT) twice a year ( October/ November and April/May).

National Apprenticeship Certificates (NAC) are awarded to those who pass the AITT.

NAC is recognized for employment under Govt./Semi-Government departments/ organizations.

http://dget.nic.in/schemes/ats/ATSOvervi...