The book presents olympiad test tasks with answers in English for students in grades 7-11. The comprehensive material offered by the authors, aimed at identifying and improving the level of phonetic, grammatical, lexical knowledge, will help the teacher successfully prepare high school students for Olympiads of various levels, serve as an incentive for the development of creative abilities, and contribute to the awakening of cognitive interest in the subject under study. The book will be useful for both teachers and high school students.