Hey, I had a very hard time with memorization as well, and as an ex dancer, that is something that is very valuable.
This is what I did to help my remember everything:
I film myself. Then I watch it over and over again. Not only did it help me remember my dance and my moves, but it helped me improve myself.
I also wrote down each move that goes w/ each count. If you write it down and memorize it ALONG with the counts, it'll help you out.
Some people also make the steps go along w/ the words, if there are words with the song. That can help alot. For example: The song talks about supporting.... maybe your hands will be lifted in their air.
It really helps
Hope i helped xxoo
good luck !