Hii, I am preparing for competitive xam and I was looking for a GK book. I was suggested by my friends and purchased it. it included lots of topic with details like- science, economic, sports etc. I have studied lots of gk book but this book is best ac to me. if we refer 3 years of this product it can help us to gain lots of knowledge and may be very useful to upsc, ssc or any competitive xam. it also provide a cd disc. you can watch and learn too. I will suggest everyone go for it if you are looking for good GK book