I am preparing for competitive exam I heard about this lucent’s general english by AK Thakur, believe me friend this is the book upon which you can generate your trust in preparation of exams, and you feel confidence while attempting the competitive exam.
this book enclose both the grammatical as well as reading and writing skills of an individual.
this book give good knowledge of basics of english which will be more useful in the above respect.
in conclusion those who are preparing for competition, go for it.