If you had to take one of your science exam again which one?

Question: If you had to take one of your science exam again which one?
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Asked by cheeseyfirebear to Chia-Yu on 21 Jun 2013.
- Chia-Yu Lin answered on 21 Jun 2013:
  
  Definitely, chemistry as I do need to spend much time to prepare 😛

Question: If you had to take one of your science exam again which one?