CBSE 10th

I am surprised that you have completed BBA without clearing 10+2 board examination. You may face problem in seeking admission in 3-years LLB course. You may check with your target university registrar that whether they will accept you for law degree without 12th Certificates.

You should opt for PCM. There are many branches apart from CSE.

If you want to become ethical hacker you are advised to plan graduation degree minimum up to BTech CSE or BSc IT or BCA or BSc CS or IT. Therefore, you may take Physics, Chemistry, Maths and Computer Science as subjects in class 11th and 12th so that you become we eligibile for seeking admission in above mentioned degree course. You can do Ethical Hacking Certification course also but for long term career growth graduation degree is preferable.

Important Advice- 11th has Media and Mass Communication Optionals now. Take those. Do Bachelor's degree in Mass Communication and Journalism. We call them BJMC, BMM, B.Sc Mass Communication, etc. and not B.Com. I don't understand why B.Com was suggested. 12th through Arts and Media options will prepare you.
After Bachelor degree in Mass Communication, do Post Graduation in Mass Communication.

If you had received a call and you appeared for GD-PI, you have chances of converting if you performed exceptionally well in GD-PI and you have good academic records.

FIIT-JEE
Allen
Aakash
Resonance
Bansal
These are some of the various classes for IIT foundation course.

Take media subject as an option in 11th and 12th as it will make thigs easy and the best option can be tourism and development of communication skills.

I am not sure about that because there are many colleges accepting NIOS certificate.