Check out "Civil - IS CodeS"
https://play.google.com/store/apps/details?id=com.civilengineeringofficial.Civil_IS_Codes
https://play.google.com/store/apps/details?id=com.civilengineeringofficial.Civil_IS_Codes
Download and Install this APP from play store... You can download all IS code category wise, All CPWD schedule, NBC, and many more...