Goutam De, B.Sc (Honours) in Mathematics, MA, B.Ed has been working as a Post Graduate Teacher of Mathematics for last 14 years. He has a vast experience of teaching the students of class 9,10,11 and 12. He has written many books for school students and competative exam preparations. His two books "TPSC Mathematics" and "Mathematics Expert" are recenlty published from Notion Press publication.