Spyder already picked on the accuracy - this is half the battle! If you don't know your test in all of its details then get someone to read it to you so you don't forget! It is still important to have the test memorized and only use the reader as a fall back.
You kept a good rhythm throughout the test - I like that you allowed the horse to be careful in that mud!! I would not be one to push a horse through something they feel is unstable. Some horses are more surefooted than others, and a few extra marks is not worth an injury.
Now - you are posting slightly crooked. Watch your diagonals as well. When you are posting your left hip likes to drop too far down, try to keep your weight evenly placed on your seat and in your stirrups and let the horse's movement lift you out of the tack. Think about maintaining your balance right over your seat bones. Your weight should not be shifting right left, forward or back. Think that there is a bullseye on the horse's back right in the right spot - you want yor balance to be right in the center of this bullseye every single stride in the walk trot or canter. This should also help with your leaning issue in the canter.
The next thing I would like to fix once you get more balanced is getting your aids under control. I don't know if your leg is gripping for balance or to keep the horse going but either way it can't happen anymore. You must sit in a way which allows your leg to hang like we newspaper down into the stirrups. This allows you to make an aid and take it off - keeping the horse sharp to the aids. You will probably notice when you start relaxing the leg - the horse will stop. This will need to be corrected by simply making a soft aid and removing it - following through with a reward or kick depending on the reaction.
As your balance, stregth and coordination improve, you will find these thigs easier, but for right now be very conscious of your balance and how you are influencing the horse. The main struggle for dressage riders is to be able to aid the horse without hindering the movement or balance.
They say money doesn't buy happiness -- well happiness doesn't buy horses!