Black belt soon

I am soon going to gradeing Taekwondo.  But to do that I need to practice my poomses. I need to know 8 of them, and I don't know 6, 7 and 8. I'm starting to get nervos becase they are harder and harder. The first ones are pretty simple, but number 4 is really hard and then it just becomes worse and worse. Poomses are like taekwondo movements performed in a special way and I need to remember every one. If the grader tells me to do number 5 I have to remember it and not confuse it with number 6. For black belt they are testing my fighting skills too. I have to fight two opponents at the same time. It is going to be very hard.
Here is a film where I'm doing poomse 2 with instructions in swedish.