Lucent samnya gyan is very popular book in terms of competitive exams held by state govts and other boards for general knoeledge. Although it is cheaper around 120 rupees but it does not have sufficient study material for all exams and the most unavoidable drawback is there is no practice questions after the topic this makes book hard to remember key points . Topics on various subjects like history, geography, polity etc. Does not cover whole topic in detail this makes it not good for all exams , I reccomend it to use quick revision and supplement your study with some other gk books. Facts are reliable books contains minimum errors and useful in 10th or 12 th level , C Grade exams not for all exams.
