How many students appeared for RBI GRADE-A exam?

Study the following information carefully and answer the given questions: 7 Person M, N, O, P, Q, R and S belong to 7 different countries namely England, Thailand, America, Canada, Germany, China and France. They are appearing for different exams- SSC CGL, IBPS PO and RBI GRADE-A. At-least 2 students appear for a single exam. R and the person belongs to Canada appeared for the same exam. The person who belongs to Thailand, S and N appeared for same exam. P belongs to neither America nor Germany. Q appeared for RBI GRADE-A   but does not belong to Thailand. The person who belongs to America and Thailand appeared for SSC CGL. R appeared for neither IBPS PO nor belongs to Germany. S belongs to Canada. P did not appear for IBPS PO. O belongs to China and appeared for IBPS PO. The person who belongs to France appeared for IBPS PO.