Nokia 1 has single core ARM Mali-T720 MP1 GPU, which has 550 MHz frequency.
Yes, Nokia 1 does have the GPS support.
Yes, Nokia 1 does have the light sensor.
Yes, Nokia 1 supports Jio VoLTE.
The Nokia 1 is an inexpensive Android smartphone, and as you can tell from the Nokia 1 review, you very much get what you pay for.