Each lesson in the 3A Corporation curriculum includes several audio segments designed to build proficiency:

Unlike the first 25 lessons, the audio for lessons 26–50 often uses the rhythm and intonation of real-life conversations.

For those without the physical CDs, several digital platforms offer the official and supplementary audio: Minna no Nihongo II 26-50 - SoundCloud

Short dialogues and questions that test your ability to grasp the "gist" rather than just individual words. Best Resources for Listening Practice