YES! Totally normal! Hormonal changes, Harder school work and higher expectations. It can take a toll.
The teachers even warned us at "back to school night" when our daughter was in 4th grade.
They encouraged us to work with our children to figure out the best way for our individual child to stay organized and to help remind them of events, homework and chores.
They gave us some suggestions, but we each had to help our children find the solutions. . Calendars agendas, files, file folders, accordion files, bigger back packs.. It took time to figure out the best way for our daughter to keep up with everything.
One of the main request from the teachers was not "save" the child by running forgotten books, homework etc.. up to school if the child forgot.
They also said they would not allow the students to call and ask for things to be sent up to school.
By the 5th grade, I never again asked our daughter if she had projects, homework or her books. She had learned how to stay organized during that year.
It can be harder for us parents to stand back and allow our children to get lower grades because of late homework, but it really is the best way for the kids to realize THEY are in charge of their own work and their grades.