Reddit mentions of Value Drivers: The Manager's Guide for Driving Corporate Value Creation

Frankly, if you are management material, your employer will probably send you to get an MBA (likely after you're already management). I suppose you could always do it on your own, if you want.

Either way, it's really easy and won't warrant special preparation prior to starting. If you're wanting to prepare for the job rather than school, you'll have to be more specific on where you want to improve. Management, as another poster mentioned, is an entirely different discipline with its own facets of challenge. It would be like asking what books you should read to prepare for engineering; if you want it all, it will be a very long list.

My contributions below are based on my own preferences, as they're the books I felt I got the most out of, but your priorities may be entirely different:

• Jim Collins, particularly "Built to Last" and "Good to Great"
  
• Value Drivers
  
• Leadership: Theory and Practice
  
• The Art of Strategy: A Game Theorist's Guide to Success in Business and Life
  
  I would also second the other recommendations of Peter Drucker (bit outdated but fundamentals are all there) and Carnegie (excellent book). There are other books with lots of great info but they tend to be course textbooks and are very, very dry reads. However, if you can get short primers on corporate accounting, operations, HR, etc. you would at least be familiar with the basics.
  
  Edit: forgot this one but it's an easy read. It's geared towards IT but provides some insights into other facets of management.
  
• Adventures of an IT Leader
  
  Edit2: forgot HBR!