Basic needs to get placement

Hi guys, the main things that every company is concentrating while they are coming for campus drive are
For Dream companies:

• C programming in detail    book to follow
• Data structures                   book to follow
• Operating Systems             videos   &  pdfs 

For Non-Dream companies:

• Arithmetic                          R.S agarwal books highly enough
• Reasoning                          R.S agarwal books highly enough
• English                               R.S agarwal books highly enough
• C programming                  The C Programming Language (Ansi C Version)  dennis ritchie c
• Little bit OS concepts        

for OS, CN gate material is also highly enough..
these  are  only a suggestion you can choose your own book to follw.