Career

Yes, why not. Any student can improve his/her IQ level by higher education and more exposure to the right education.

Hi Smita,
These are apparently the highest paying jobs in India in 2017:
Chartered Accountants
Medical professionals
IT professionals
Technical writer
SEO Analyst
Digital marketing professional
Marketing professionals

In the end, it's up to you what you wanna do after LLB. There will be many options but from which college you have done law will play an important role as college provide placements these days.
1) Law firm (Associate)
2) MNC (Legal officer)
3) Govt. Agency
4) Judicial Exams
5) Bank, Legal Dept.
6) Litigation
7) LPO
So, it's up to you where you wanna go. Litigation will the best option if you wanna learn basics but as money matters as well go for a law firm. After 2-3 years, you can join any MNC as well.

Muskan,
For a career in banking after class 12th (PCB), you can go for courses like BBA, BBA (Hons), BBA-MBA, etc.
These courses are going to equip you with the theoretical and practical aspects of business and managerial skills. After the course from a good university, you can get a placement in a good private bank or you can prepare for some bank papers and cracking them to become a part of some good govt. bank.
There are many good govt. and private universities like IIM, Indore; GGSIU, Delhi, LPU, Punjab; GU, Visakhapatnam, etc., that are offering these courses with good placements.
Check their websites for more details.
Good luck.

By completing a Bachelor's degree course, you would be eligible to attain a Bachelor's degree through the concerned university. You need to prepare well for the exam, you can also use the past years sample papers.

Professional courses are better than normal B.Sc.
You can do B.Sc in nursing.
BPT (Bachelor of Physiotherapy). There are many other good courses if you have an interest in the medical field.