GMAT Strategy

Hello Guys,

I'm from India,I have completed mechanical engineering, working in an Automotive Technical Centre as CAE analyst from past 4 years.
I want to do MBA (Regular/Executive) from any reputed B-Schools abroad to improve my carrier growth as well as earnings. I'm planning to take GMAT, but right now I'm in grate confusion, so many questions are roaming in my mind. Following are few of them.

1. Can I crack GMAT??(I'm not very good at English, since I have completed my Schooling in my regional medium, I can manage QA and DI well though.)
2. Where should I start preparation??
3. How much time it will take for preparation??
4. What kind of MBA program to choose??
5. I have done my graduation from a C grade institution, my academics are good though. What are my chances of getting in to top 30 B-Schools in this regard??
6. I heard that we need to involve in some extra curricular activities to get into top B-Schools, unfortunately I don't have any and frankly I don't know what kind of activities they consider. Considering this, what are my chances into top B-Schools??
7. Finally, can I afford MBA (Regular/Executive) in abroad?? (as a middle class citizen of India)

So please, please guide me and suggest me in get rid of all these obstacles.

Thanks in advance