CBSE 12th

Hello Shah Rukh!
The minimum eligibility marks in class 12th to get a college with JEE main and advanced marks (JOSAA counselling) you need to have at least 75% marks.
So, you are not eligible for JEE main 2018.
It is better to try for the colleges that admit based on both JEE main and board exam marks for admission.
Or else, you can go for a good university with your board exam scores and then do M.Tech in a reputed institution.

You can opt any subject you want because for NIFT entrance you need GK, English, Maths (till class 10) and Logic Reasoning. So your class 11 & 12 stream won't matter.

First complete your Intermediate Level or SSC, then after that you can go for engineering or medical sciences. Other than these, there are many other courses depending on the field of interest.

To be truthful about it, you may give the improvement exam, but that would increase your percentage depends on you totally if you are willing to work hard this time. Scoring just 53% in today's time is kind of frustrating but you can improve it. Just remember to work hard and remain sincere to yourself.

Hello Sakshi,
Your daughter managed to score very well in her boards and Jee Mains. However, according to her rank, there is some chance for BIT-Mesra, but it will be better for her to take a break and prepare well for next year, she will really get best the colleges next year with a little push.
All the best.

Hello Utsav,
To become a pilot in IAF, you have to join NDA after class 12th. To become a commercial pilot, you will have to join a flying school for a three-year course.

Hello Vaibhavi,
Yes, definitely you can. But you must analyse your failure and take corrective action immediately. Hard work can achieve anything. Where there is will there is a way.

Hello Vaisnavi,
You have scored that are really low. I would sincerely advise you to leave obsession of engineering. But if you must then only management quota will get you admission.