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Ya u can prepare.But at home u need to study every aspect u must have to refer various books etc.and I guarantee u if u prepare in this way it will take minimum 2 years to complete ur portion.But coaching institutions will make things easy for u.They know on which topic we must stress and they will guide u.
And coming to essay writing - let us think that u prepared very hard and practised writing many essays.But who will correct ur essays how will u know ur mistakes.SO I SUGGEST U TO TAKE COACHING FROM ANY EXPERIENCED INSTITUTES.
To my knowledge vajiram & Ravi institute is the best coaching institutes in India.It is in Delhi.It was established in 1978 .
and download IAS app it will help u in ur prep
ALL THE BEST

Choosing the right institute or university is always important when it comes to pursuing a professional course. Preparing students to succeed in today's challenging environment demands a real world based educational approach. When it comes to finding the best BBA colleges in Pune, a good number of options are available. And, it is always important to research well about the institutes to get admission to the best one. The best college is ranked higher for its quality education, learning facilities, career opportunities, placement assistance and more. Based on all these factors, here is the compiled list of top colleges which you may consider for admissions in BBA in Pune:
DY Patil International University, Pune (https://www.shiksha.com/university/d-y-patil-international-university-Pune-56973)
Indira Institute of Management
Amity Global Business School
Vishwakarma University.