Rotation (day/night cycle), revolution (seasons), and the Earth's shape.
Based on curriculum standards and contest materials from that year, the tests typically covered: otvety multitest po geografii 2017 goda 6 klass
Finding the specific answers for 6th-grade geography can be tricky as these contests are often organized by private educational centers (like Olympus or Albus). While a single official answer key for every specific version isn't always publicly hosted on one site, you can find the relevant materials through the following sources: Key Geography Topics for 6th Grade (2017) Characteristics of tropical rainforests
The composition and roles of the Lithosphere (landforms), Hydrosphere (oceans and rivers), and Atmosphere (weather and climate). Rotation (day/night cycle)
Characteristics of tropical rainforests, deserts, and coniferous forests. Where to Find Answers and Practice Tests
Тесты с ответами по географии (6 класс) - Инфоурок
Sites like Infourok often host archives of various school tests, including geography variants for Grade 6 with included answer keys.