Dear student, Syllabus of PRMO is spread over Class 11 to Class 12 levels, but the problems under each topic involve a high level of difficulty and sophistication. The difficulty level increases from RMO to INMO to IMO. Various topics are uovered under the PRMO syllabus from class 8, 9, 10, 11 & 12. The difficultly level is same for all the classes students.