A 75.8% in dressage is a great score! It breaks down like this: 4 or lower is considered insufficient, 5 is sufficient, 6 is satisfactory, 7 fairly good, 8 good, 9 very good, 10 excellent. As an amateur, anything 60% or above you should be pretty pleased with. I was taught that if you are regularly getting in the 70s its time to move up a level. If you look at results for USDF championships you’ll find a score that high to be pretty rare. Pat yourself on the back for score of 7 on rider!