CAT 2013 will be conducted in coming October and notification to this effect is likely to be out on July 21, 2013 (Watch this space for latest news on CAT 2013)
For QA, you need to brush up your basics well and focus on your calculation tricks to reduce solution time, lower the mistakes and emphasize on accuracy.
DI is all about studying and understanding the data that are in question. DI involves a lot of calculations and to get things correct in less time, learning the tricks and tips of Vedic Mathematics is the best idea.
LR has neither any written syllabus nor any prescribed formula. You need to think logically in order to find out the solution of the problem stated in this section. You need to organize your thinking ability step by step in order to find out a solution.