The phrase "an additional grade" is correct and usable in written English.
It can be used when referring to an extra level or category, often in educational contexts or assessments.
Example: "To improve your overall score, you can submit an additional grade for the extra credit assignment."
Alternatives: "an extra grade" or "a supplementary grade".
As those children move through the school, the organization will take over control of an additional grade each year, sharing the building with the public school while gradually supplanting it.
And retailers are typically not set up to offer an additional grade of gasoline at their pumps: if they wanted to sell E15, they would have to stop selling something else.
Sweden, however, extended the international PIRLS sample (grade 4) with an additional grade 3 sample in 2001, while Iceland and Norway added grade 5 samples in 2006.
The Harlem-based public school, which at first admitted only kindergartners but has phased in an additional grade level each year, has been considered a success.
Meniscal morphology was assessed in six regions by using a modified WORMS: the medial and lateral sides of the anterior, body, and posterior regions; an additional grade was added to the meniscal classification 'intrasubstance degeneration' to better assess early degenerative disease.
Some schools just have all the juniors wear the belt with the white stripe for all grades and some schools have it as an additional grade between each belt.
Here we suggest that a single additional grade of A* will soon be of little help to medical educators, and that a higher grade of A** should be introduced as the system is being revised.
The player's performance in each mission is given a letter grade of A, B, C, or D, with an additional top grade of S. Grades are based on the time taken to complete the mission, the amount of "red orbs" gathered (the in-game currency obtained from defeated enemies), how "stylish" their combat was, item usage, and damage taken.
Hospital-only-reported complications: For this cohort, there were an additional 113 Grade II V complications in 104 surgeries reported by hospitals but not reported by patients on FUL, with the commonest being infections followed by wound breakdown and lymphocysts/lymphoedema.
Our preferred estimate for the school attainment coefficient from the IV-GMM estimates, with all three life-cycle experiences included, is 0.09 SD in verbal skills for every additional grade, or approximately 0.30 SD in verbal skills for a 1 SD increase in school attainment.
If only school attainment is included using OLS, the estimated associations indicate increases of 0.22 SD of verbal skills and 0.15 SD of nonverbal skills for each additional grade attained.
