Khan Sir is an Indian teacher who is known for his unique style of teaching, especially topics related to current affairs. He is the founder of Khan GS Research Centre. Khan GS Research Centre.When he was studying in school, he became interested in joining the Indian Army and took the entrance exam for Sainik School; however, he could not clear the examination.He also appeared in the entrance exam for polytechnic; however, could not achieve a good rank.When he was studying in school, he became a member of the National Cadet Corps (NCC).In an interview, he talked about his IIT entrance examination day and said that he slept late at night before the examination; he could not wake up in the morning and missed his examination.Later, he appeared for the NDA examination and cleared it; however, he was eliminated in the physical round due to his bent arms.After he could not clear any competitive examination, his father asked him to learn some skills and get a job after which he learned how to do welding and drive a JCB machine.His friends Hemant, Sonu, and Pawan helped him in beginning his career in teaching.Initially, he started teaching at a coaching institute where he had only six students. Later, the number of students grew up to 40, then 50, and ultimately, more than 150 students started getting tutored by Khan Sir. In an interview, he told that he had become so popular among his students that the owner of the coaching institute feared that if he would leave the institute, the students might also leave, and the owner told him to remain in disguise and not to reveal his real name. Soon, he earned the name Khan Sir. According to him, he is also known by the name Amit Singh among his students.In 2019, he started a YouTube channel, Khan GS Research Centre, where he started uploading videos of various issues, especially current affairs. Soon, his channel became very popular for his unique style of teaching, and the channel went on to have more than 9.26 lakh subscribers.