How to connect 3 routers in a LAN?

Question

Computer networks

There are 3 subnets:
Subnet A (Computer Room 1):
192.168.0.0 - 192.168.0.127
Default Gateway: 192.168.0.127
Subnet B (Computer Room 2):
192.168.0.128 - 192.168.0.191
Default Gateway: 192.168.0.191
Subnet C (server):
192.168.0.192 - 192.168.0.255
Default gateway: 192.168.0.255
I distributed IP to all PCs, connected everything, but I can’t figure out how to connect routers correctly.