The phrase "in eleventh grade" is grammatically correct and can be used in written English.
It is typically used to describe a person's current grade level in high school. Here is an example: "I am currently in eleventh grade and studying for my college entrance exams."
Exact(17)
Like the other boys, he was invited to Berman's apartment, in eleventh grade.
In eleventh grade she had become aware of her effect on boys-almost all of them.
In eleventh grade, Harold developed a crush on his history teacher, Ms. Taylor.
He dropped out in eleventh grade, cruised Whittier Boulevard in a 1965 Chevrolet Malibu, and got tattoos ("Born to Raise Hell").
Altshuler reread the book in eleventh grade, he said, "and that's when I got the idea that I'd like to do something with it".
She missed Key West not at all, despite the fact that she had been elected Miss Conch in eleventh grade at Key West High.
Similar(37)
Miss Murphy in first grade.
In second grade, he unraveled.
They were in fourth grade.
team in eighth grade.
But in seventh grade, he was expelled.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com