110cm is the offical length. It may differ depending on the show.
It depends whatever the dressage test you a doing .Normally you enter at A .
Yes, you should plait your horse's mane and tail for lower level dressage. Grooming your horse and plaiting up shows respect to the judges. In higher level dressage, you may not need to, although you should always check with your instructor and the rules of the show. You will see if you watch videos of high level dressage test horses are unplaited and unbraided.
at the letter A
I think so
No. Dressage has no jumping at any test level. But 3 day eventing combines Dressage, cross-country jumping, and stadium jumping in that order, one event per day.
All dressage tests do, besides introductary level. But if you're at a show, the only ones that don't are "walk/trot" classes! :D
an oppiate
No
No. Only a blood test could show that.
no.
You can usally get it online. If not, join the USDF (United States Dressage Federation) and you can register your horse for Dressage that opens up a whole bunch of new shows. And most likely you can get the Level 2 most current tests there.