This sounds like an excuse. You should be practicing what your instructor taught you and building that muscle memory so you can learn more next class.
We have a girl in my school, around 10 years old, and she's quickly becoming one of my favorite students. She doesn't grasp all of the concepts right away, and she struggles mightily with a lot of things when she gets a new belt. But the thing about her is, I give her one piece of advice every class, and every class she comes in and I can tell she has practiced and destroyed whatever advice I gave her. That leaves her ready to accept the next piece next time.
Most of the other students don't do this. I don't know if they just don't practice at all, or if they "practice" by just playing around, but a lot of the other students it takes longer for them to iron out these details. If I give a kid advice on something, and next class they're still working at it, I let them struggle with it for a couple weeks before I bring it up again. Some kids, I bring up the same thing every couple of weeks, and it's clear they are not practicing at home with the presence of mind to fix this issue. They take forever to progress in their skills and in their belts.
A beginner should be practicing what they were taught, so they can be ready to learn the next lesson.