Revise Chinese Singapore

This app is a companion app for Singapore primary 3 to 6 students to help them revise their Chinese vocabulary.

There are 3 types of revision:
- Phrase reading
- Phrase writing
- Phrase understanding
- Mixed (all of the above)

Special features:
- Revise by primary school level and semester
- Text-to-speech output for Chinese phrases
- Test yourself on new words
- Test yourself on recent mistakes
- Statistics that show your progress in terms of questions answered correctly and wrongly
- Modify vocabulary list based on your needs

Known content error:
- Primary 3A, "背着" should be "bēi zhe" instead of "bèi zhe". Will fix this in the next release.