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ATMA (AIMS Test for Management Admissions) is a national level entrance examination conducted by the Association of Indian Management Schools (AIMS) for admission to MBA/PGDM programs offered by various B-schools in India. A score of 99.47 percentile in ATMA is a very good score and puts you in the top 1% of test-takers. With this score, you can expect to get admission to some of the top B-schools in India. However, the college you can get admission into also depends on other factors like your academic record, work experience (if any), and performance in the selection rounds (Group Discussion and Personal Interview conducted by the B-schools. Some of the top B-schools in India that accept ATMA scores include:
Xavier Institute of Management and Entrepreneurship (XIME)
Great Lakes Institute of Management
Institute of Management Technology (IMT)
Institute for Financial Management and Research (IFMR)
Balaji Institute of Modern Management (BIMM)
Prin. L. N. Welingkar Institute of Management Development & Research (WeSchool)
KJ Somaiya Institute of Management Studies and Research (SIMSR)
Jaipuria Institute of Management
PSG Institute of Management
Symbiosis Institute of Business Management (SIBM)
I would suggest that you do some research on these colleges and their admission criteria and select the ones that match your preferences and career goals. All the best!

Ans Below is the procedure
Eligibility (I) A candidate for being eligible for admission to the Degree course in Bachelor of Business Administration shall have passed 12th standard. Examination (H. S. C. 10+2) from any stream with English as passing subject and secured 40% marks at 12th Standard. For candidates in Open Category and Reserved Category as per Maharashtra State government. Rules the eligibility is at 35%. (ii) Two years Diploma in Pharmacy after H. S. C. , Board of Technical Education conducted by Government of Maharashtra or its equivalent. (iii) Three Year Diploma Course (after S. C. , I. e. 10th Standard) from Board of Technical Education conducted by Government of Maharashtra or its equivalent. (iv) Higher Secondary School Certificate (10+2) Vocational (MCVC) Minimum Competency Based Vocational Course Examination with 45% marks for candidates in Open Category and 40% for Reserved Category candidates as per Maharashtra State government. Rules.