Hi guys.. The website Btechguru.com has lot of useful materials to prepare CAT exam.
For sample question papers, visit http://www.btechguru.com/showSubMenu.php?mid=1&smid=3&ssmid=13&smcid=87
To read through study material, visit http://www.btechguru.com/showSubMenu.php?mid=1&smid=3&ssmid=13&smcid=194
Videos on how to prepare Aptitude Test are available @ http://www.btechguru.com/CAT/listSubjectLevel.php?sid=0308dbfeac255507&bid=2b8acd8811d8c7ef&subjectName=Logical questions&branchName=Logical Reasoning