If you are preparing for these exams in a Belarusian school, keep in mind these official health and safety norms : Classes can have a maximum of .
Classification of substances, chemical reactions, and properties of oxygen and hydrogen. Important Rules for School Tests
Какие предметы в школе самые сложные - ИнтернетУрок
: The official site of the publisher Aversev offers free downloads of answers for the manual "Algebra. Grade 7. Independent and Control Works" . These booklets usually contain 6 variants of each test.
: The National Institute of Education (ADU) provides teaching materials including "Physics. Control and Independent Works: Grades 6–9" . This collection includes five difficulty levels for each task to match the national curriculum.