SELECT grade ,  count(DISTINCT classroom) ,  count(*) FROM list GROUP BY grade
For each grade, return the grade number, the number of classrooms used for the grade, and the total number of students enrolled in the grade.
[Schema (values) (types)]: | student_1 |  list : lastname (text) , firstname (text) , grade (text) , classroom (number) | teachers : lastname (text) , firstname (text) , classroom (text);