Nihongo no Mori uses a "Piece" (ピース) method for JLPT prep — each grammar point, vocabulary set, or reading strategy is a "piece." For N2, they have specific "piece" videos (e.g., 第1 piece , 第2 piece ).
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Listening is the hardest section for most learners. Nihongo no Mori has a "Shadowing" series specifically for N2.
The free YouTube content is the best place to start. For N2, the channel offers complete playlists covering: