fix school management sort bug

app/services/management/school_report_service.rb

@@ -83,11 +83,11 @@ class Management::SchoolReportService
         .select("#{base_query_column}, COUNT(*) student_count")
     when 'homework_count' then
       schools.joins('LEFT JOIN courses ON courses.school_id = schools.id')
-        .joins('LEFT JOIN homework_commons hc ON shc.course_id = courses.id AND hc.homework_type = 4')
+        .joins('LEFT JOIN homework_commons hc ON hc.course_id = courses.id AND hc.homework_type = 4')
         .select("#{base_query_column}, COUNT(*) homework_count")
     when 'other_homework_count' then
       schools.joins('LEFT JOIN courses ON courses.school_id = schools.id')
-        .joins('LEFT JOIN homework_commons hc ON shc.course_id = courses.id AND hc.homework_type IN (1, 3)')
+        .joins('LEFT JOIN homework_commons hc ON hc.course_id = courses.id AND hc.homework_type IN (1, 3)')
         .select("#{base_query_column}, COUNT(*) other_homework_count")
     when 'course_count' then
       schools.joins('LEFT JOIN courses cs ON cs.school_id = schools.id AND cs.is_delete = 0')