CBSE 12th

Well, you have various courses to opt other than engineering.
Check the following link for some science courses offered by DU for undergraduates:
http://www.du.ac.in/du/index.php?page=old-undergraduate-courses

Can you please clearly mention your percentile? It will help me in giving you a better opinion. If you don't wish to disclose it, then it's fine. Anyway, your scores in 10th, 12th are not so bad. Your marks should not be an issue for you to get admission into XLRI.

This is not a big problem. I got just 71 marks in maths and 86% in 10th. After getting low marks, l took PCM in 11th because I wanted to become an engineer. I practiced to improve my maths consistently and now I'm one of the toppers in my class. You can improve your strength in maths.

Sorry, you are not eligible for IIMs.

Yes, it is possible but you have to do hard work because after two years you have to face maths which will be difficult for you.

Firstly, you should have more than 75% marks in class 12th exams (if you are in CBSE board). Then you have to pass its physical test which consists of several rounds.

There are so many scholarships available after class 12th
Like
1. Foundation for excellence
2. Ongc scholarship
3. Seimens scholarship
4. IOCL scholarship
5. FAEA BHEL scholarship
and many more. You should visit the website buddyforstudy. Com to get the list of some useful scholarship after 12th.

Also,if you got under 100 rank you can and get 100% scholarship in tuition fees.

My dear friend,
You have not mentioned about any examination. So enlist first the name of the exam so we could give an appropriate suggestion. Thank you.