CA

To clear CPT, you required 30% marks in subject and total marks 100 out of 200. For clearing IPC and CA final, you will be needing 40 marks in each subject and 50% marks overall.

It is not compulsory after completing your graduation. With atleast 60% marks, you can register your self for IPC but before registration, you should complete a training.

After 12th for doing CA, you should register your self for CPT and after clearing that, you should register yourself for IPC and after clearing that, there are some training like ITT-OT complete that and then registered yourself for CA final.
You should choose commerce for doing CA.

Hi,
MBA will give you skills required for operation in corporate along with knowledge. Completing CA will be a tough call.
All the best.

CA obviously it's a broad area of accounting having 4 groups (2 of IPC and 2 of Final) after passing your 1or 2 IPC group you are eligible for training (article-ship). For rest of the information, you must visit at:
www.ICAI.org

Yes, it is quite possible for you to join the coaching centers. However, your first priority should be clear 12th with so that you could be able to perform and prepare well for CA.

Not necessarily, but for knowledge, you can pursue it if you are free for a month or two.

Your question is not clear. I assume you want to know which country is better to do CA among New Zealand and India.
If yes - it is important where you want to settle down in India or in New Zealand. If you have plans to go and work in New Zealand then better you study there. As most foreign countries accept their own degrees and certificates.

Yes, of course, you are eligible for CA. Do CPT first and then do CA. But, its a very tough course. Equivalent course is CPA (Chartered Public Accountan).