Lucent general knwoledge is the best book but now a days this book is not sufficient for competative examination because it contain all old topic. But not contain new general knowledge things. 5 years ago for competative exam lucent general knowledge is perfect solution for general awerness section and general science section. But now a days question in competative exam is very few qiestion come from this book . So I am not tell the book is useless. I as pery experience this book only use low level competative exam .not benifitable for higher level exam like ibps .rrb. one thing is best about this book is beginer use for this for some basic knowledge. Because all thing about in this book is gives very short and simple language . So student is easy to understand . And again the book is very less about rs 150 to rs 200 . Book is free from printong mistake. And paper quality of book is very good.