Change in data given in economics

No..not at all.

Also for preparing Economics u can puchase the book named Cpt General Economics -by S.K.Agarwal. published by S.Chand. This book is really helpful for Cpt( both macro and micro economics is covered in the book )

study material is also gud for cpt (economics)..........

Ya its good .. but i found that reference book more useful..if u study it it's more than enough.

S.Chand Publications Are One Of  The Best And Very Helpful Aswell............