This app is a frequently used word app for HSK.There are no ads, so you can concentrate on studying.It has vocabulary book and vocabulary test functions.【Vocabulary Book】1st class: 1532nd grade: 3063rd grade: 6054th grade: 12055th grade: 25056th grade: 5018[Vocabulary test]The following four types of questions for each level strongly support vocabulary acquisition. ·meaning ·pronunciation・Listening・Pinyin【review】You can check the history of the vocabulary tests you have taken and review the questions you got wrong.