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Dear Mohammed Faziz,
I am very much glad to know that you have really great, different and adventures ambition. See, to join ATS, you don't need to clear any entrance exam because they have their own procedures and criteria to select a candidate for the team. Their selection procedures mainly based on your academics. They don't bother about your stream. But you must go for civil services exams like UPSE or any other defence organisation's exam.
Your physical fitness. I don't think that you need any explanation on this.
Your past records of performance. It shows that how effective you are and your capabilities to work under extreme and pressurised conditions. Based on theses factors they automatically pickup the candidates and offer them positions in extreme defence sectors like RAW, IB, Military Intelligence or ATS.
My suggestion is that you must have to prepare for civil services exams (most preferred NDA but you can't as you are a commerce student) like IAS or IPS. Try to get into army and they will pick up automatically as their is no criteria to apply individualy.
Hope you find this helpful.
Kindly upvote the answer if you feel satisfied.
Ask any query any time.
Best of luck dear.

You should pursue a course wherein your interests lie. Health care and MBA are two very different verticals, and their scope varies as well.
Health care scope: Career Scope in Healthcare Management. An MBA in Health Care and Hospital Management may appeal to those interested in the pharmaceuticals sector, government agencies, insurance organizations, hospitals and consulting firms in the health sector.
MBA scope: The scope of MBA course is increasing day by day. MBA is one of the big job oriented professional program and the most one which has been sought by the students.
Once you have completed your degree, you have a great job opportunity in the industrial world. You may the manager or executive in term of designation.
The management term is most suited to the managers and that's why it is the way, where you can reach on the top of the height as soon as possible by using your leadership and working proficiency.
An MBA professional always plays a vital role in his/her company and this is why, he used to keep in touch with the board of directors.
No need to specify the companies who recruit the MBA professionals. The all sectors including government and public have various industries, companies, institutions or related organizations, come in the job prospective fields for an MBA professional.
Some job profiles are listed here:
Brand Manager
Account Manager
International Business Manager
Marketing Executive
Business Technical Consultant
Business Development Executive
Marketing Manager
Management Consultant