Its ok
Seems like it could be better. The Chinese speaker talks very quickly so its kind of hard to hear the pronunciation. She also speaks in the Beijing dialect, not standard mandarin.
Not enough ratings yet to assess Primary Oral Chinese.
Primary Oral Chinese appears to be a legitimate app. AppsHunter Legitimacy Score for Primary Oral Chinese is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.