Everything is ok from Amazon side as well as Lucent side. But in terms of content quality, it's very obsolete. Lucent have to redesign it .. today all online exams are conducted by TCS.. TCS pattern is concept oriented, not fact oriented.. This book is factual, if you go through CGL/CHSL/CPO 16-17-18 (even 15) paper.. you will feel the standard is much higher than it.. TCS pattern is far different from traditional / sifi pattern / They no follow formative approach... N.B. It has a few wrong answers .