Hi Veeresh,

Assuming that you are asking about the subjects involved in the GMAT exam, there is no specific subject which is focused on entirely, although the different sections essentially evaluate a candidate's quanititave and verbal aptitude.

The Quantitative Reasoning section is similar to basic school level mathematics for Indian students. The Verbal Reasoning can be understood as a more advanced level of English vocabulary and unseen passages. The Analytical Writing section involves comprehensive essay writing. And finally, Integrated Reasoning is mostly basic aptitude. 

Therefore, comparing with common subjects, GMAT generally tests students in the domain of English and Mathematics.