Back to school!

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Across
  1. 3. You use this to work out sums (10)
  2. 5. You write on this (5)
  3. 9. A flat paper container for a letter or thin package (8)
  4. 11. Re-arrange these letters to make a word: SSCEER (6)
  5. 13. A container to carry your midday meal (8)
  6. 14. This is the liquid in your pen (3)
Down
  1. 1. A numbers subject (5)
  2. 2. You raise this when asking a question (4)
  3. 4. You do this every day at school (5)
  4. 6. A shortened word for Advertisment (2)
  5. 7. You use this to write (3)
  6. 8. This is something your teacher gives you (8)
  7. 10. North,South____,West (4)
  8. 12. It may take you to school everyday (3)