Hello Student,

See I don't know why are you asking for old NCERT books because new ones have much more information than older ones. However you cannot get that old version NCERT book of bio in local book shop you have to go no to some metropolitan cities book shops you probably can found that there like for West Bengal it is Kolkata. However you also can find that by searching it online. It also can be available in some Ecom websites for sale.