I want to start of with the aptitude preparations. I need to know the best books,websites, etc that would help me out in this. Kindly Help.

I'm doing BE in CSE. Just finished my 6th sem exams and into 7th sem soon. I want to start of with my prep in aptitude and willing to take up exams and tests available for recruitment and placement. I want study by my own, so i need to know a list of books,websites,test that would be of great help.