Have you been through Read Real Japanese yet?
http://www.amazon.com/Read-Real-Japanese...1568365292
If your goal is strictly leveling up on the JLPT then the essay volume, http://www.amazon.com/Read-Real-Japanese...1568364148 , is probably more appropriate (because the JLPT is entirely non-fiction and mostly essays or sentences that might appear in essays), but I never used it so I can't directly testify to it. But Read Real Japanese (fiction) did wonders for my ability to actually read the books I want to read so I have some faith that the non-fiction volume is equally good for that style of writing.
OTOH, if your goal is to consume Japanese fictional media (novels, manga, movies, anime, and dramas) then the fiction volume is vastly preferable. It was for me a great bridge from beginner's material to 'real' material. Maybe I just went through it at exactly the right time, but still, I can't recommend it highly enough. I don't think any other single activity advanced my ability as much as going through that book. Mind you, I did add a ton of vocab to Anki from the book, listen to the CD repeatedly, and look up vocab points in the DoBJG. But as long as you're ready to devote the effort to going through it in an 'intensive reading' fashion, there are very few other resources that let you go as deep into the language in as short a time as that book. (Presumably both books.)
http://www.amazon.com/Read-Real-Japanese...1568365292
If your goal is strictly leveling up on the JLPT then the essay volume, http://www.amazon.com/Read-Real-Japanese...1568364148 , is probably more appropriate (because the JLPT is entirely non-fiction and mostly essays or sentences that might appear in essays), but I never used it so I can't directly testify to it. But Read Real Japanese (fiction) did wonders for my ability to actually read the books I want to read so I have some faith that the non-fiction volume is equally good for that style of writing.
OTOH, if your goal is to consume Japanese fictional media (novels, manga, movies, anime, and dramas) then the fiction volume is vastly preferable. It was for me a great bridge from beginner's material to 'real' material. Maybe I just went through it at exactly the right time, but still, I can't recommend it highly enough. I don't think any other single activity advanced my ability as much as going through that book. Mind you, I did add a ton of vocab to Anki from the book, listen to the CD repeatedly, and look up vocab points in the DoBJG. But as long as you're ready to devote the effort to going through it in an 'intensive reading' fashion, there are very few other resources that let you go as deep into the language in as short a time as that book. (Presumably both books.)