MBA aspirants must note that CAT 2013 which is being conducted in coming October is a computer based test hence, besides being computer savvy you need to manage both tome & speed in CAT.
Two sections DI+QA and LR+VA will have two different allotted timings of 70 minutes each section. Back and forth is not allowed so speed & time are very crucial for you.
Practicing with Mock Tests is the best way to manage the above. Your portal MBA Rendezvous has posted 180 questions with solutions and directions on both CAT sections. You will be guided with more than 1000 questions before September so practice as much as you can.