Each section had 10 one-mark questions and 20 two-marks questions. When the IIMs reduce the number of questions, the biggest victim was the choice that a test taker had in terms of the number of questions that he could skip.
Having gone through the paper, I believe the section that was tough was the Verbal section. Some of the questions that carried two marks had two plausible answers and it is mere chance that the answer a student chose matched that of the correct ones as IIMs would have thought.
And one big revelation this time was that the IIMs clearly mentioned that the negative marks for getting a question incorrect is one-third the correct answer. So, all the double guessing of progressive negative that CAT test takers in the past had to put up with is off.
What next in CAT 2006? They might just decide that in addition to having negative marks for getting a question incorrect, they would want to penalize you for not attempting a question. Well, CAT 2002 or 2003 had a Math question using this concept!