Try to understand how the trainer thinks ie is he setting a horse up for a race or is he using it to get it race fit. focus in on horses that like certain tracks tight bends usually suit forward running horses ,long straights suit sitters.
Focus on good jockeys for that track the better the jock is running the better the ride he is offered, The best jocks usually end up with the best rides as they make more money that way,
Hope this helps