u003cstrongu003eAu003c/strongu003e. If you are pretty sure that you are well-versed with the teaching procedure and can handle each age group of students, then there is no need. But sometimes every teacher encounters some challenging questions, you can find answers with self practicing guidance books like:u003cbr /u003eTiger tales,Tiger team, Tiger tracks (level 1-6 pupils books, activity books, teachers books) by Carol Read.u003cbr /u003eYoung learners by Sarah Phillipsu003cbr /u003ePractical English Usage by Michael Swanu003cbr /u003eTeaching Tenses by Rosemary Aitken