CBSE 12th

No doubt MBBS/ BDS are the best options after 12. If you are not intended to join them, there are several other options -
NursingCourses
Physiotherapy
Optometry
paramedical Courses
Biotechnology
Bioinformatics

If you are determined towards the civil services, then go for BA and just ace the exam later.

Sorry to tell you Rahul, but this rank doesn't fulfill the requirements. But still you can fill MAET, MSIT, GTBIT, BVP and HMR.

No, at this rank you can't get admission in LNMIIT, Jaipur. Last year's cutoff was around 110. You can check colleges under JAC Chandigarh. All the colleges under JAC are very good except UIET regional campus Hosiyarpur.

If you feel there was some good reason that you couldn't perform well in JEE, then only you should go for it. Because 2 years drop will make a big difference for your career as it will shift 2 years ahead. And there is no surety if you could perform well in the next year's attempt.

Banking and is just a 2-year course. It does not possess any degree. If you want a degree, you have to do professional Banking after class 12th. Same goes with Insurance, you have to give exams through Insurance Institute of India.

B.Tech in computer science engineering, Information technology or software engineering will be best for four. You may opt for BCA as well. B.Sc IT may be another good option.

You can simply complete your +2 with commerce stream.

Just practice a lot.
Do different types of questions in accounts, you can score very high in it.
Just try to read daily 2 topics and revise it in one or two weeks.
Economics and business studies are theory subjects so you will have to improve your presentation skills more better and attractive.
Good Luck.