The basic
skills and fundamentals remain unchanged. You don't have to worry
about focusing upon new areas of study. As long as you have
prepared well, all you need to do is practise mock tests keeping in
mind the new timing system. Along with focus and self-belief.

On What things I have to FOCUS on:

1.Finding
a question similar to something you have practiced before has a
very calming effect on you and will help boost your confidence. The
best way to achieve this is to practice all kinds of questions. If
you've covered everything, there is very little chance of getting
caught unaware.

2.There
are some very good modules available for learning, practising and
testing. Make good use of them! Modules like Test Gym and MBA-on-Demand
are especially helpful in this final, critical period. Moreover,
these are available online and give you the added advantage of
familiarising yourself with the online medium.

There are certain mistakes that many students make. You can steer clear of them by using these techniques:

3)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.

For more info: http://onestopmba.com/mba-faqs/details/how-to-succeed-in-cat-exam-292.asp