Back to school (troll edition)

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Across
  1. 1. the shortest subject this year
  2. 4. the English thing we all forgot
  3. 6. the subject of a sentence
  4. 8. a classmate-stabing instrument
  5. 10. the forbidden word
  6. 11. powerful _____
  7. 12. the bane of Kadlčíková's existence
  8. 13. the thing that is caused by teachers
Down
  1. 2. the best subject, 100%
  2. 3. Kadlčíková's most favorite accessory
  3. 5. co-lloco
  4. 7. the best teacher ever
  5. 8. the most used object in boring lessons (= not English)
  6. 9. students' best friend