Mr. Ratan Kumar Roy did his PG from DS College Katihar in 1997. He joined as a faculty in Sachdeva New PT College and Guidance simultaneously in Kolkata. He taught plenty of students over there in his 3 years career & many of them got success. Their successes inspired him to select this as his career. Presently he is actively engaged in teaching entire chemistry since last 15 years.His lessons make home in the brain of students. He makes the students to realize chemistry & doesn’t force to memorize. He makes the learning of chemistry all interesting, effective & fun. He believes that chemistry lies in understanding and not in memorizing. Enormous numbers of students have successfully cleared various competitive exams of engineering & medical in past 15 years under his guidance.