Hello Abhinesh !

As you want to pursue M.B.A. from abroad , you don't have to give CAT and GRE as CAT is for doing MBA in India B-school and GRE is for pursuing M.S from abroad , however there are some universities which accepts score of GRE for MBA , but GMAT is the exam in which you need to appear if you want to pursue MBA from abroad.

And , along with GMAT you have to appear for other English tests also , as foreign universities usually have a eligibility criteria regarding these test scores also like TOEFL etc.

Now , as per the recent outbreak happened may be you cannot pursue education from abroad this year , as many countries have declared lock down.

As per your financial conditions I will surely suggest you colleges , if you can tell me that in which year you want to pursue higher studies.

Also , I will suggest you to prepare for CAT as old IIM's have also a good ranks globally. But it depends on your interests that from where you want to pursue your education.

Hope it helps !