CAT 2013 will be conducted in coming October 16 to November 11 but notification to this effect is likely to be out on July 21, 2013 (Watch this space for latest news on CAT 2013)
Meantime you can start with Mock Tests which will give you confidence for preparation.
Read & practice with Solutions & Directions for Questions on both sections of CAT 2013 with360 questions, solutions with directions.
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