Class 11th     Ist part 
http://ncert.nic.in/NCERTS/l/kech1dd.zip

IInd part  
http://ncert.nic.in/NCERTS/l/kech2dd.zip

Class 12th Ist part  
http://ncert.nic.in/NCERTS/l/lech1dd.zip

IInd part  
http://ncert.nic.in/NCERTS/l/lech2dd.zip











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