CBSE 12th

You will get LNMIIT-Jaipur, JIIT-Noida. You can also get a college under JAC, Chandigarh. UIET (Panjab University) for electrical branch. Chances are also there for lower NITs and IIITs.

There are immense option in the commerce field from a small accountant to very big industrialist like Ambani. wherever you move your eyes, you will find options in commerce.

Go for B.Tech. You can take admission in the colleges written below:
College of engineering, Pune
Maharashtra institute of technology, Pune
Sinhgarh Engineering College, Pune
AISSMS College of Engineering, Pune

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.