Hi 

Apptitude section consists of 

1)Quantitative aptitude 

2)Logical reasoning 

3)Verbal .

For quantitative aptitude we suggest you to prepare from the Quantitative aptitude by R.S agarwal.

Topics - time and work , number system , percentage and ratio etc 

For logical 

Verbal and non verbal reasoning by R.S Agarwal 

Topics - directions , blood relation , puzzle test , series completion .

For verbal ,

You must read as much you can .reading will improve your reading and comprehension and many practise question are available in online .

Thanks