Class 12-Commerce

You should opt for BBA. It is the best choice.

It depends on your hard work. It takes a minimum of 5 years for a person to become CA.

Maximum reputed institute need 60% aggregate percentage in class 12th. But, you don't need to worry because many other institute are here for BCA with your eligibility. All private institute has management quota, so try to get admission through management quota by getting provisional admission.

It will depend partly on your IELTS scores. If you manage to get 7+ overall bands, then you can apply to any top university under SPP. If you get less than 6.5 bands then you will have to go for non-SPP application.
Also, please mention which course are you interested in pursuing?

Nope, not at all.

CISCO does not specify any educational qualifications for appearing for CCNA. There are age criteria for appearing for CCNA. You can appear and get CCNA certification. Indian companies prefer network engineers with graduation degree in engineering or BCA/ MCA, etc. Therefore, I will advice you to gain at least graduation degree, beside CCNA for a good career.

You should do your B.Com from a good institution or you can do BA in economics.

You should do the graduation first like B.Com or BBA. Then, you should give the exams of government exams also. There are many exams for government job. You should try that and you will get good government jobs if you score well.

Hello Nishish,
The basic eligibility for B.Sc (IT) degree is class 12th from science stream with physics, mathematics and chemistry as compulsory subjects with minimum 50% marks aggregate.