Visit Free Preparation site  to prepare aptitude for CAT, GRE, Campus Placements.  This site covers Quantitative Aptitude, Reasoning, English, Placement papers, Group Discussions, HR Interview questions to prepare you comprehensively for competitive exams. 

With 6 millions pages views an year, Campusgate is one of the best site for TCS aptitutde preparation.  This site covers more than 500 questions with detailed explanations. 

Topics Covered

Aptitude: 65 articles on Aptitude with theory, sovled examples, detailed solutions
Reasoning: 20 articles on Reasoning
English: 30 articles in English
Group Discussions: 20 topics with content
HR interview questions: 50 most important questions with suggested answers
Placement papers: 100 Papers with solutions for TCS, Infosys etc
Technical: 14 articles on C language
General: 10 Articles