CBSE 12th

The general eligibility criteria to be eligible for applying for BCA course you must have completed your Higher Secondary (+2) Examination equivalent (Diploma degree), with minimum 50% marks in total and also having Mathematics as subject in the qualifying examination.

MH-CET (entrance exam) has been made mandatory for admissions to ILS.
Stay tuned to Directorate of Higher Education website, Maharashtra State March onwards.

Either you will go for revaluation of your mark sheet and this process will take time. Till then, you will be wasting your time in all these stuff. It is better to focus further and look up for the colleges which can provide quality education.
All the best.

JEE Main gives you three consecutive chances of applying for entrance exam first in your 12 and 2 in next two years.

Whatever is genuine, you have to mention that in your resume, whether it is high or low. And only 12th percent doesn't matter, your skills are much more important.

My dear, concentrate on your 10th first. You make your own decision after that, what you like the most. Because you can't succeed in that field where you are forcefully admitted yourself. So, whatever you think is best for you target that field because every field have a lot opportunities.

You can fill the registration form as there is a chance, though a bit less, and appear for GD-PI as selection depends on GD-PI as well along with other credentials.
All the best.

Hi,
You can refer to the NCERT books for preparation. NCERT is more than enough to help you score well in the exam.