Essays are important, so is GMAT. Dont overlook any parts of the application, just do your best at all parts. Depending on your execution, you can get to the best schools, or you can go nowhere.
It is all right that you dont have a clear plot of your career path at this point. it is unjustified to let someone decide your career path for you. Let yourself do it. Do some research, there are so many good articles on top of this forum that will help you to understand yourself.
Thank you everyone, I know my question seems silly...
Personally, I wanna learn something about marketing and business. But the fame of Nokia attract me at the same time(if I went to Nokia, I think I will do technical relevant job, like support).
I want to go for MBA, cauz I somewhat lack of experience and systemic knowledge in management. MBA will help me build my knowledge structure and also help me to get good future.