There are certain mistakes that many students make every time they sit for the final paper. If you keep a track of these mistakes and avoid them, then for sure, you can handle the pressure of pattern change as well.
Divide your section into sets. Read all the questions in each block and assign them an equal amount of time. These time limits should be sacrosanct. There can be nothing worse than missing out on an easy question just because it appears towards the end of the section. Thus, selecting the right questions is extremely important.
Speed matters. Not only when you’re solving questions but when you’re reading them! The faster you can read all the questions and select those you think you should attempt; the better will be your chances of a good score.
For some students, solving a question becomes an ego issue. This is the worst thing you can do to your CAT 2012 paper. If you have spent a considerable amount of time on a problem to no avail - leave it and go ahead. There may be an easier question ahead, just waiting to be capitalized upon.
There will be no time in the CAT 2012 for being indecisive about your answers. Especially if you face a pattern change, the new format should not make this harder for you by taking away some of your confidence.
If you know your basics and you are sure of your solution, pattern or presentation change should be the last thing on your mind to achieve mission CAT 2012