IIM

Yes, you can get it. Meanwhile, it is recommended that you develop an experience of at least 3 years so that you can qualify for entry position into IIM's teaching faculty.

You must be a graduate with the following requirements as per the category
(overall Cat score, sectional cutoffs, 12th %, 10th %)
GEN 90 80 60 60
OBC (NC) 80 70 60 60
SC 65 50 55 55
ST/ PWD 55 40 55 55
The process will consist of the following with the given weight ages.
Personal Interview 45%
CAT 35%
GD/WAT 15%
Work Experience Quality 5%

Hi Nallathambi Gunasekhar,
At any time you will be informed to report in the respective institutes. Generally, by this time it supposed to start.
All the best.

Most IIMs offer courses like post graduate Diploma in management in streams like finance, human resources and HR. Some top institutes offer specialized MBA in operations and international business.

You can apply for CAT. Since, you know that you are weak in English, you are probably going to score poor in CAT. So, rather than planning just to go for MBA like everyone else. Why don't you work on improving your English?

Yes, it is good, if you are opting for IIM to pursue MBA. You have to prepare for accounts subject as it is related to the management subject.

Our institute selections are only on merit basis.

If you are in class 12th, the best option for you is integrated management program at IIM – Indore, which is a 5 years degree course equivalent to an MBA. Else, you can do 3 years any graduation preferably BMS, economic honors, BBA, etc. and you can prepare for CAT exam.

It depends on CAT score, which is mandatory to get admission in IIM followed by GP and PI.
For further information, you can visit the below mentioned link:
https://www.way2college.com/articles/one-off-page/iims-in-india