I suppose it’s a little early to be practicing for the case interviews that happen in the management consulting field. Typical case book questions, puzzles, etc. include things like "how many gas stations are there in the US", "why are manhole covers round", "can paper manufacturers be profitable", and "how would you value and price the use of a teleportation machine". Though one can appreciate how the companies test for an applicant’s analysis, business knowledge, logic, reasoning, and synthesis skills, case study prep can drive one to insanity.
So if you need a laugh while practicing for the genres of case that require on-the-spot/off-the-cuff numerical analysis and some basic knowledge of stats, check out this essay on "Why I Will Never Have A Girlfriend". (Hat tip: del.icio.us).