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Hello Mayank, After completing your Post-graduation, you are eligible to appear in the UGC NET exam from the same or related subject. As you have completed your Post Graduation Diploma Business Analytics you are eligible for UGC NET Economics also. But make sure you also fulfil the other eligibility criteria also. If you are confused for the UGC NET selection criteria you can check
NTA will soon release the UGC NET December Application form. Apply online window will open in the month of September. I hope the given information will help you out. Still, if you have any doubt, you can comment your query in the comment section below. All the Best!

There are few options you can try to cover up the intervening period well before MBA season kicks off:
Don't look out for jobs, get an internship instead: It's difficult for a fresh graduate to grab a good paying job off campus in most of the cases. Companies aren't willing to extend quality jobs to freshers that easily as they simply look out for candidates with stellar profiles. However, getting an internship might not be that big of an issue. HR people usually prefer internships over full time job for one special reason: Lesser compensation for an equally challenging work profile. Therefore, you might have to compromise on remuneration if you opt for an internship in a suitable domain. Take up a domain neutral profiles: Profiles with designations such as Research Analyst, Management Trainee, etc. are considered to be general management profiles, thus they are not domain specific. In other words, you will not be working for a particular management field. Do not plan professional experience but something else: If Plan 1 & 2 don't work out, you can always opt for things which you might be interested in.
What about becoming a private tutor or maybe start working for an NGO? These might not add something substantial to your CV, but they do provide ample opportunities to learn and grow as an individual.
Still not satisfied? Chuck out everything. Get enrolled for year long full time Diploma course of your choice and be a Diploma holder by the time you join an MBA college next year. Remember you can pursue CFA in addition to any of the four options stated above. But, don't pursue only CFA as its just one exam that you'll have to clear in a year. Not a full time commitment.