CBSE 10th

I don't think that you will be able to fill in the CAT form as you do not meet the minimum criteria of 50%. Please have a look at the eligibility criteria for appearing in CAT examination.

Focus on your study. If you get a good B-School then don't worry about your placement.

Please go through the following links carefully to understand the admission process in IIMs:-
https://www.shiksha.com/mba/articles/iim-indore-admission-criteria-2017-2019-cat-2016-allotted-only-20-weigtage-blogId-13359

Hello,
Kindly go through this link:
https://www.shiksha.com/mba/resources/iim-call-predictor
Good luck.

Most of the colleges have eliminated the GD process and replaced it with WAT(Written Ability Test) which is more of a test of your thought formation and english writing skill and not just about having the highest voice in a fish-market. But PI still remains the most integral part of the process. Hence if you feel that you are not confident enough in English, I would suggest you work hard towards it and if required join a coaching center for the same and overcome your hurdle.

There is a job for everyone. So it's not like you will not get a job. You might get a job but not the best one. Having said that, I would like to emphasize on the fact that your academics decide your 1st job only. After that academics are irrelevant, and it's your effort and dedication that defines success in your career. Hence never give up.

After 10th, you can only be admitted to 11th. The requirement for Bachelor's (abroad or here) is 12th pass or it's equivalent.