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