CBSE 10th

You have to select biology stream in class 11th and have to get a good knowledge of basic biology.

As per the criteria, you should have 60+ throughout in your academics, still hope for the best.

You stand a chance for sure. You have not mentioned about your CAT score, which may also be a requisite.
All the best.

As per the criteria, your academics should be 60%+.

You can send them an email requesting the change you require.

Yes, for MBA, graduation is the main eligibility criteria which you have. There is no any much important role of 12th standard.

You should complete class 10th, it's really not the age to give up on studies even if you are interested in computers. You can take CS or IP as an elective in class 11th and can go further with it.

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.