MathMaster

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[Update details]
* New content
1. New message box open!
- When you learn, your mom will send you praise in the parent app!
- Mom sends you missions through the parent app!

* New features
1. Add reverse keypad order setting
- A function has been added to select input starting from the ones digit.
2. Resource Management
- When capacity is insufficient, please delete resources!
3. Add study notification push

* New event
1. Keyring event starts once a month.
2. An avatar contest will be held.