No. Vivo Y95 does have a dual sim card slot and a dedicated memory card slot. You can use 2 4G sim cards and a MicroSD card at the same time.
Yes, Vivo Y95 does have the gyro sensor.
No. Vivo Y95 does not have the front camera flash but it does have the display screen flash.
Yes, Vivo Y95 does have the dual camera set-up at the rear side. It has a 13MP primary rear camera and 2MP secondary rear camera.