Contests were conducted on many subject of Soviet school curriculum such as Mathematics, Physics, Chemistry, Biology, and others. These Olympiads had several levels based on Soviet Union's administrative structure. These were: School, District ("Raion"), City, Regional ("Oblast"), Republican and All-Union contests. These competitions were organized separate for every school grade. Depending on the subject and geographical region the highest round of the Olympiads varied from the All-Union level in Mathematics, Physics, and Chemistry to the Regional level in some other disciplines.