The American education system

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Across
  1. 2. at (...), the students study for a degree in a particular field of study
  2. 4. synonym for physical education
  3. 6. don't forget your calculator! We've got (...) at 8.30 o'clock
  4. 7. (...) is the science of life and living organisms
  5. 8. before children attend primary school, they go to...
Down
  1. 1. when something is not optional
  2. 3. formal event where students receive their diploma
  3. 5. students in their final year of high school