Terms for subject Informal containing grade

English	Russian
a grade of “five”, signifying “excellent”	пятёрка
a grade of “four”, signifying "good"	четвёрка
a grade of “three”, signifying “satisfactory.”	тройка
a grade of “two”, signifying “poor”	двойка
high-grade gasoline	супер
high-grade soap	ядровое мыло
lowest grade in school	колы (самая низшая школьная оценка; единица gramota.ru)
student receiving grade four = good	четвёрочница
student receiving grade four = good	четвёрочник
student receiving grade four	четвёрочник (= good)
student with only the lowest grade "two" in her record	двоечница
student with only the lowest grade "two" in his record	двоечник
student with only the lowest grade "two" in his record	двоечник
third-grade student	третьеклашка (masc and fem)
third-grade student	третьеклашка