Hey as per my idea preparing for ICET for MBA is a good option as it will give you good options

Qualification
Candidate should be graduate from recognised university
Final year candidate can also apply
Candidates can be of any stream

Here I am giving you some books to refer for ICET
Word Power Made Easy for Vocabulary
Wren and Martin for English Grammar
English Novels and tales for Reading Comprehension
Daily News paper business column for Business terminology
Reasoning R S Agarwal
Time Material

Sections
Reasoning
Aptitude
English
General knowledge

Selection criteria
Entrance test
Group discussion
Interview