Does anyone else feel like their brain is full?

[ArthurMucha]

I have been studying the anatomy section for my HESI exam for a week straight, and I think I have hit my limit. I am trying to memorize all the bones and muscles, but it feels like there is no more room in my brain. I took a practice quiz this morning and my score was even lower than last time. I feel so discouraged and frustrated. I started looking into online HESI tutoring because I am just not getting it on my own. Has anyone else felt this kind of mental block?