I am doing MCA and I'm topper. I want to join google or yahoo after education. I don't have any referral. Can anyone suggest me?

I am good at programming fundamentals and have some fundamental idea in designing techniques of algorithms. I am in one of the best colleges in Andhra Pradesh. My communication skills are just not bad. I know the fundamentals of C,C ,Java,SQL well. I am a bit good at data structures also.