School's subjects

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Across
  1. 1. E=mc2
  2. 3. Triangle, cube, pyramid...
  3. 6. Kangxi, Qianlong, Mao
  4. 8. 10+8-3=？
  5. 12. Explore the Earth
Down
  1. 2. Using a keyboard
  2. 4. I'm your teacher
  3. 5. Painting and drawing
  4. 7. Mixing liquids
  5. 9. It's noisy
  6. 10. 1 2 3 4 5 6 7 8, 2 2 3 4 5 6 7 8
  7. 11. Study of life