I, Mohammad Shoaib Khan got education at Science College, Patna, and passed M.Sc (Maths), and then worked for some time as a lecturer in a college at Patna. During police service, I had been the Superintendent of Police of ten districts of Bihar State. After retirement from police service in mid-2006, I joined as a member of Rahbar Coaching- a unit of non-profitable Bihar Anjuman. and started teaching students coming from the downtrodden class of our society. The interaction with such students inspired me to write Math books from class 4 to class 11 and several others.