Exam

After you get your score card, you need to apply for every individual college, so that as per their eligibility criteria they can call you for GD-PI.

Yes, you can appear for CAT, SNAP or MHT-CET MBA entrance exam. To appear for MBA entrance exam, you need to have a graduate degree.

You can appear for CAT exam while pursuing the last year of your graduation but you need to present your graduation certificate during the admission process.

Dear Shivani,
First, you need to understand why candidates appear for GMAT exam.
It is not necessary to have work experience to take the GMAT exam because GMAT is taken majorly by MBA applicants, the percentage of candidates having work experience is high.If you are planning for MBA abroad, then yes

Scholarship is not just score based but every university has its own eligibility criteria to grant scholarships to international students. In order to know the exact eligibility criteria, it would be always advisable to browse through the university's website you wish to apply.
Overall, scholarships

Education plays a very important role in your professional career. If you are keeping time element in your mind, get admission in a management college this year. If you want to get admission in a good institute for better career growth prospects, then you can wait.

The improvement form will be available at the end of August and first week of September on official website of CBSE from where you can fill the improvement form. You will give the improvement exam in all the subjects or that subject in which you got less marks or it's your choice which subjects you