Practice Toccata, namely the back half of it.
Try even watching some of the videos of other people’s parts and playing along with them. If you encounter problems in a certain section, DO NOT JUST GO BACK TO THE BEGINNING. First, FIX WHAT IS WRONG. Even after you play it correctly, play that section several more times correctly before moving on. Remember, practice makes permanent, not perfect, so if you’ve played it wrong several times, play it right as least as many times if not more.