CBSE 12th

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.

Hi Shariq,
Yes, you can. You will also have a chance to appear this year, it is better you attempt your improvement this year too, if required or your scores did not improve you may attempt again in 2018, which would be the last chance.

Hi Chetan,
In order to facilitate Shiksha experts to give you accurate and precise answers, it is important that you give us a little more information regarding the subject you are currently studying (stream: Arts, Science or Commerce) as well as your interests. Once you share this with us, our experts will be able to help you out better.

You will not be able to get admission with a compartment in class 12th.

Hi Adil,
You are eligible for a number of scholarships including CBSE scholarships. You can also check the KVPY scholarship exam. You may check here:
http://indiatoday.intoday.in/education/story/cbse-scholarship/1/531836.html
Chances are high.
All the best.

Hi Muskan,
You can apply under provisional admissions, but you cannot enrol or commence studies till you clear the compartmental subject.

Hi Vedant,
Yes, you can repeat class 12th.

Hi Aman,
Completing your 10+2 is ideal for better prospects in terms of higher studies and careers. Doing a Diploma will limit you to a particular field only and you won't be eligible to take most entrance exams.

Hello Sujit,
To get admission in NITs, you need to have 75% marks in your board exams as you have got only 50%, you have no chance to get an NIT. It is better if you choose a college that offers admission based on both JEE Main scores and board exam scores.
All the best.