Better chance of winning
Ride a horse that is "A" or "B" rated with a lot of stamina that prefers to be at the back of the pack. When about 5 furlongs away from the finish line, press Triangle to get closer to the front. Use most or all of your stamina before letting the horse run out to the leaders.

PS2 Cheats for G1 Jockey

G1 Jockey cheat codes

G1 Jockey cheats