B.A

You can pursue online graduation degree; - https://www.talentedgenext.com/course-listing/graduation Bachelors of Arts [BA] from top UGC approved universities through TalentedgeNext - https://www.talentedgenext.com/
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Yes, of course, you can do it. All the best for your career.

You are eligible.
Eligibility
Candidate must have passed 10+2 or its equivalent with special aptitude in Vocal Music from a recognized board.
You need to directly apply to the college.

Best college for Bachelor's of Arts in Criminal justice in Maharashtra are-
St. Xavier's College, Mumbai
Fergusson College, Pune
Jai Hind College, Mumbai
St. Mira's College, Pune
Kishinchand Chellaraman College, Mumbai
Sophia College for Women, Mumbai
Wilson College, Mumbai
Mithibai College, Mumbai

Certifications are mostly independent from the graduation you do. So, you can go ahead and do Microsoft certifications of your choice. All the best.

IGNOU B.A. Admission 2019 The Indira Gandhi National Open University offers admission to B.A. Programme in both January and July
So, you have to apply for entrance exam in July.
All the best be prepared for the exam.

Yes; you can easily opt for B.A. In criminal justice as normally as you can do other courses.
You can find the best college in your area and visit the college. If you are looking to study criminal justice in depth, and would like to enter into criminology or criminal psychology fields, you should consider the Bachelor of Science option. In the end, don't fret too long over which degree type you should pursue. Both the BA and the BS options in criminal justice are sought after by employers and graduate level academia.
Don't worry, you'll be just fine.