The .rar extension suggests you might be looking for a downloadable archive of for a specific level. 2. Academic & Technical Papers

or Spotlight 10 often refer to specific page numbers or exercise keys in Workbook/Student's Book materials.

There is a technical presentation titled indexed as item 163 in certain digital libraries like the TIB AV-Portal . 3. RAR (Rest-Activity Rhythms) Research

If you are looking for school materials, is a popular English language series (e.g., by Express Publishing/Prosveshcheniye).