Log every bit of my life!

I think working for Google is a good opportunity and a big challenge for any developer. So, I understand why you are wondering about it. But as you said, it's good for your future so why don't you try to do?
Completes your studying is the best way I think but you can not negotiate with Google about start working time, I think you can suspend your studying for 1 or 2 years as Bill Gate did. Maybe you can not make a company as Microsoft, but no one knows whether you will create a Google Viet Nam in future!
You should think more what you lost, what you get if you work for Google and for Exo Platform. As you said, Exo is a good company in Ha Noi, but with my experiences, 1,5 months can not say anything. And are you sure that you understand everything about the one? Is it really good place as your feeling?
You are having a big opportunity! I wish you will have good decision!