Aruna Singh M.Sc, B.Ed. NLP Practitioner, an avid painter and art enthusiast. Had been in the teaching profession for more than three decades. Taught classes from the primary level to senior secondary classes. Has experience to teach Cambridge courses too. Had grown step by step to be the Principal of a K12 school. Has authored academic books for classes 10 and IGCSE. Although been working as a principal but remained a teacher at heart, as the saying goes “once a teacher always a teacher” This book has been written keeping in mind the difficulties faced by the teacher community. This would work as a teacher ready reckoner hand book which every teacher should go through and imbibe the contents.