Hello.
You may want to also focus on a lot of brain-teaser questions such as why a manhole is round.
Here is a website that has a few:
http://www.princeton.edu/~canturk/puzzles.html Focus on personality questions.
www.acetheinterview.com is also a good website. Usually big companies hiring permanents focus very much on appearance, and personality.
I have never been interviewed by IBM, but this is what I heard, many puzzle questions to
test your ability to think, good luck.