Need C-DAC advice and suggestions!

Hello,

I am going to appear CDAC this year. I will be appearing Section A and Section B. Please suggest books for:

• C/C++ and OOP concepts
• Operating System Fundamentals
• Data Structure

Also, please suggest any other books that I need to study to get good marks in sec A + sec B!
Currently, I am studying Wren And Martin Grammar, R. S. Aggarawal for Quant and Arhiant's Verbal Reasoning for Section A

How many people appear C-DAC every time ?
Are there any interviews post written test?
How much do I need to get to get into Bangalore/Hyderabad/Pune Training Centers?

Thanks in advance.