In order to get full credit (a distinguished score) for control of syntax and grammar, a student displays basic comprehension and organization of syntax and mechanics, such as spelling and grammar. true

I would say this is true as syntax means the arrangement of words or phrases and grammar and spelling are part of this ie grammar is the system and structure of a language such as that a sentence must have a subject and a verb or that tenses must agree or that plural nouns must consistently be treated as plural and that words are spelled correctly to give the correct meaning, as examples.