卡卡日语 is an essential software for Japanese language learning and exam preparation. It includes a vast range of real exam questions from 2010 to July 2021 for N1, N2, and N3 levels. The program offers features such as exam simulation, detailed answer explanations, a Japanese grammar question bank, and vocabulary memorization using the Ebbinghaus forgetting curve method.

The software provides intelligent customized study plans based on the Ebbinghaus memory retention principle. Users can benefit from different study modes like list and card display, with real voice pronunciations for words and sentences. Additionally, the app supports vocabulary expansion through a personalized word bank and offers efficient learning with random and sequential list ordering.