Colleges in Ahmedabad

There are a lot of colleges who have their own exams. You can give them and then apply for the respective colleges. Also, there are exams like CMAT and MAT. You can write them and apply for colleges for MBA on the basis of your scores.

Which CMAT are you talking about? It is yet to happen for this academic year.

You need 99+%ile in CAT and your profile including your work experience and your scores in previous exams also matter a lot.

Not all the network marketings offer you a certificate of work experience but if your company is ready to give it then it's good but you still have to get 98.5+ percentile in your CAT to be eligible.
Good luck.

Post graduate Diploma in Supply Chain Management program provides an opportunity for vertical growth. Students acquire professional competencies in materials management and logistics, leading to an improvement in their job skills and self-enrichment. The program begins by laying the ground work for a comprehensive understanding of what supply chain management is and how it can be effectively used to increase an organisation's efficiency and profitability.
The eligibility criteria for this program is a Bachelors degree holder/graduate in any discipline from a recognized university. Hence, you are not eligible for this course.

Any score of 99.6+ is good with that profile for IIM, Ahmedabad.
All the best. I hope you get that score.

Yes, you will be able to take admission but it depends on the college cut-off.

Yes, you can start the preparation for CAT. First check out the syllabus and pattern of CAT exam. Start brushing up the concepts of Maths and English (Grammar). You can sit for CAT exam in your pre-final and final years of graduation. Apart from scoring well in CAT. You must need to score well in graduation. Check out the selection criteria of top-20 MBA institutes of India. This will give you a good idea what are the expectations of institutes from MBA aspirants. Best of Luck.