There are three different sections of Business Administration, Marketing, Managemant and Financial Management.
These books will do the job for you:
Management by Richard L. Daft
Marketing Management by Phlip Kotler
Financial Management by Van Horne

Also try the notes from VU through following links:
Principles of Management
http://rapidshare.com/files/19845009...Management.pdf
Principles of Marketing:
http://rapidshare.com/files/19845075..._Marketing.pdf
Financial Management:
http://rapidshare.com/files/19844970...Management.pdf

But i want to ask you that why are you selecting Business Administration, you have to cover a lot of course and its also not much scoring. Why don't you go for Public Administration which is more easy to cover and more scoring.

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It's lack of faith that makes people afraid of meeting challenges, and I believe in myself!!!!