As has been said, don't worry too much about your percentages, particularly at the moment. Schooling shows have a tendency to get the judges who will be extremely lenient, and often will throw in extra marks for 'giving it a go' rather than judging what is in front of him.
When I was 10 years old and doing pony club, I frequently scored anywhere between 70-90% in tests. Thought I was the bees knees until I went official and scored 45% with a real judge :P
Get your tests filmed, and instead of thinking about the percentages, read the judges comments and go by what YOU thought of your test. Don't say 'it was perfect and the judges were wrong', pick your test apart and learn from your mistakes. Go home and work on those mistakes, and the next time you compete and you ace any one of those 'difficult' movements, put a feather in your cap because you have just improved :)
And hey, we ALL have bad days! I've certainly had my fair share, state championships last year, I rode a RIPPER of a test, was absolutely thrilled with it, got to A to turn back down the CL, my horse decided she'd had enough, jumped sideways out of the arena and we were eliminated! I checked my scores against the placings, and I had done a better test than some of the top horse/rider combinations in the state! But hey, I can look back and say oh well, just because I didn't place that doesn't matter, I rode a really good test!
Then only last weekend, I rode a new horse in just a couple of novice tests, first test was ok, she's quite a strong mare and takes a lot of core strength to keep her forward, connected but not pulling. Second test she had had enough, picked up canter and tanked off at a million miles an hour. I had zero breaks and all I could do was 'haul' her around in the general direction of the test. She was so tense that she threw in 5 flying changes through the shallow loops and lengthens across the diagonal.
I walked out of the arena laughing about it! Just something to work on!! And hey, I ended up picking myself up another ride as the owner was watching me ride and was impressed with how I dealt with it.
So 'bad' rides are not all bad :)