Background: I did Japanese for two years in university, and we finished Nobuko Mizutani’s Introduction to Intermediate Japanese. At present I can read manga and (simple) books without trouble, but college textbooks, news articles, and very dense prosaic novels still baffle me. So are there any textbooks I could look at buying to continue studying, or am I at a point where I should just be reading as much Japanese stuff as I can and looking up what I don’t recognize?