I want to study for the JLPT with authentic sentence examples, in-context Japanese. Does anyone know a resource for this? I have searched for a long time, and I haven't found anything.
It might be helpful to define what you mean by "authentic sentence examples". Actual sentences that have appeared on past exams? Study materials oriented towards the JLPT with "in-context" sentence examples? Or, content written for native speakers that would be helpful for JLPT study?
In terms of made-for-native materials that might help on the JLPT... newspapers, essays, editorials? In the sense of preparing for a test oriented towards foreigners, native content is probably best for vocabulary acquisition.
I would say that ultimately if your goal is to pass the JLPT then you should be utilizing materials oriented specifically for the JLPT. My favorite is the 完全マスター series. They have editions for grammar, kanji, reading, etc. Light on explanation and heavy with sentences and reading passages. While reading passages have a topic or theme, the one-shot example sentences have no broader context but I still found them useful and easy to study with.