Razu sir and Saifur Rahman Khan are the key Persons of english language teaching in Bangladesh. Razu Sir is the best teacher of IELTS in Bangladesh who scored band 8.5 in IELTS,(CELTA- Certificate In Teaching English to Speakers of Other Languages ) qualified, scored 1570 in SAT. He has written around 100 books of saifur’s publications. He is the most reliable person to Saifur Rahman Khan Sir.