Advanced Japanese Flashcards
Sometimes it can be really, really hard to find good study materials for advanced levels. At least without having to dish out a lot of money for advanced books (which I've done in the past, some I've then never used).

Which is why I've already put a lot of advanced materials into free digital flashcards for people to use. 

Here are all the advanced Japanese flashcard courses I've made on memrise:

Newspaper Japanese 

Advanced Japanese Reading Practice 

Breaking into Japanese Literature 

Complete Japanese Keigo 

3000 N1 Vocabulary 

JLPT N1 Vocabulary 

JLPT N1 Kanji 

JLPT N1 Grammar 

Let me know if you find these useful, or if there are any other flashcard courses you'd like!