I'm afraid this would be too much to fit in one response. I'll do the first level of "Natural Science", and you can tell me if I should correct anything.

Subjects: Biology, Chemistry, Earth science, Astronomy, Physics

- Is it focused on a planet / planets?
  - Yes: Earth science, Astronomy - Is it about our planet in particular?
    - Yes: Earth science
    - No: Astronomy
  - No: Biology, Chemistry, Physics - Is it about living things?
    - Yes: Biology
    - No: Chemistry, Physics - Is it on the level of molecules?
      - Yes: Chemistry
      - No: Physics
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