Vivo S1 has ARM Mali G72 MP2 dual core GPU.
No. Vivo S1 does not have the FM radio support.
Yes, Vivo S1 has a dedicated MicroSD card slot. You can use 2 sim cards and a memory card at the same time.
Yes, Vivo S1 comes with 18W fast charger in the box and the mobile has fast charging support.