In no particular order:
The above are some of the best books I read during my M.B.A. program. I enjoyed business school, and I think I acquired skills and changed my thinking in ways to bring me life-long benefits. It may seem like a lot of books, but this just scratches the surface of the number of books I read during business school.
I used to read the WSJ daily since undergrad, but I ironically stopped DURING business school. Especially after if not during an MBA program, you will come across a lot of buried stories. We had a class on the financial fallout and had to do brief presentations on difficult culprits. Anyway, a part of my presentation was the burying of bad economic news.
But since we are recommending periodicals and not just books, WSJ is probably fundamental - but so is the HBR. I have not read the HBR for a while, but I used to always enjoy reading it.
Personally, I prefer the Financial Times to the WSJ; but you should get both.
I actually never subscribed; I would just read a copy in the library.
By the way, someone recommended True North by Bill George, and that is another book I read during business school that I would recommend now.