sure thing man , buy some horses that have good feel and temper,then race them trying to get good evaluations(a/s/c/etc)after the race this raises your jockey stats and ranking.
the higher these are , the better horses you can get.
i find mid -pack runners and preceders are easiest to get a good eval with.
for preceders : u need to be a length or so behind the leader as soon as pos.in the race
for midpack : un need to be dead middle pack or just behind(use pack meter on right), this is easier for a cheaper slower horse to do.

for both: i usually push on to full speed at 3f and whip once at 2f,then at 1f if needs be.
following this should get good evels if not a few 'star wars bursts'..happens when you ride perfect race.also try to keep your speed meter in the blue(but still keep horse in good pos......position is soooo important.each horse will be slightly different too so get used to your horse and adapt your style slightly to each one.

hope this gets those ratings up,Beige