"in her grade" is a perfectly correct and usable phrase in written English.
You could use this phrase when referring to a specific person's grade in a subject, class, or school. For example: "Mary received an A in her grade."
Her compatriot Deborah Criddle came second in her grade.
She told me the girl had been in the "gifted"' program in her grade school.
She estimates that a quarter of the kids in her grade have one, and, by senior year, "really, like almost everyone.
She grew up on the border of Ossining and New Castle, and said that in her grade school days, she was a closet songwriter, heavily influenced by Judy Collins and Cat Stevens.
Budhos's eighth-grade heroines are Jaya from Trinidad, shy and artistic, who lives with her widowed mother, a housecleaner and baby sitter; timid Maria, recently arrived from Mexico, who translates for her mother during interviews for office-cleaning jobs; and Lola from Slovakia, bright and contentious, whose mother is a housekeeper for the family of a boy in her grade.
She had already aced her Advanced Placement exams in American history, world history and French, not to mention calculus, a class she took her junior year, one of only four students in her grade at Bronxville High School to do so.
To see the transformation in her grades was amazing – and something I fully credit to Wattpad.
There the story might have progressed along a predictable continuum had Dr. Drager's parents, Marvin and Lenore Drager, not noticed a slight dip in her grades.
Chaney wrote that "too many" of the musical numbers were "weak imitations", which was reflected in her grading: her median grade for the nine numbers was a "C+", and her highest grade was a single "B+".
Clothes Fall Off, who saved ground under jockey Jevian Toledo, split rivals in the stretch and rallied to finish second in her graded-stakes debut, 1 1/2 lengths ahead of Lady Sabelia.
