INNY, you might want to try to eliminate some races first. Not all races are good options to bet in. I recommend not betting in maidens, Class 1 and Class 2 races. There is little exposed form in these races and horses tend to be inconsistent. Wait till a horse has formed some patterns, winning or losing, and then start to sort out the muddle. Another race type to avoid is the one where a lot of horses are resuming, especially the top 5 weighted horses. More than 2 of the top weighted horses resuming and I don't bet.

Hope this helps