What is the minimum CGPA required for a job in companies like Amazon, Microsoft, Google in NIT Patna?

Microsoft , Google never visited our campus for recruitment ( atleast during my 4 yrs in the college). Amazon recruited few students for summer internship ( after 6th semester) from our batch.Then those interns were offered PPO in the 7th sem. Amazon tried to recruit directly for Main job( I Mean not intern) but it ended up not recruiting that way. The minimum CGPA was 6. They conducted a test. From those results students were filtered and called for further rounds.