No. Redmi 6 does not come with the earphone in the box. You need to buy it separately.
Yes, Redmi 6 does have a fingerprint scanner. It also supports the face unlock.
Yes, Redmi 6 does have the AI face unlock functionality.
Yes, Redmi 6 does have GPS support.
If your budget absolutely can’t exceed the Rs. 8,000 mark, go with the Redmi 6 without any concerns whatsoever.