Hello, I have this horse, has a Fitness of F. Whenever I train it, it never finishing the training because the horse either bolts, or is just to hard to ride. I only train it was it has energy of around A/B. I have tried training it at only 50% 70% and such, but still no results. I have also tried different equipment but still have not found anything that works.
Can anyone help me please??
Have you tried changing the jockey? Sometimes a certain pairing won’t work. And don’t worry, the fitness will eventually get up there. 
As I’ve said before, unusual events (such as bolting, bucking, spooking, etc) are generally caused by too much energy or too much fitness. (In the case of inexperienced horses, it can also be inexperience.) Given that you know it’s not too much fitness, it’s probably too much energy.