Learn Chinese - HSK

The app has 4 main sections:

HOME Tab shows the following 3 information:
The number of known or memorized words
The character of the day
The score evolution on the last 7 days.

LIBRARY Tab has 2 sections:
My libraries - Libraries created by the user
HSK libraries - Standard HSK libraries .

For each library a label with three numbers (blue, red, green) shows the library's status as following:
blue - the number of words that are unknown
red - the number of words that are added to a personal library (ready for practice)
green - the number of words that are marked by the user as "known" or "memorized".

PRACTICE Tab allows the user to practice the words from desired libraries. There are 2 ways to practice:
Translating a sentence from Chinese to English or vice versa
Translating a word from Chinese to English or vice versa
Scoring:
Correct answer: 100 points
Wrong answer: -50 points
Withdrawing of a word after it was selected: -10 points
Mistakes:
The "life status" is marked by 4 stars, the user can make maximum 3 mistakes, after the fourth mistake the practice session will be ended.

SEARCH Tab: words can be searched either in Chinese or in English.