Before you usher them off to a tutoring center it would really pay for the parent to talk to the teacher first. They are with that child everyday and they have such a good feel for how that child is progressing compared to the other kids in the class.
Before you run off to a million different tutoring systems, have the school test the student to see if he or she is grappling with issues or just needs some extra help. You don't want to fix what is not broken.
The problem with these classes is that the tutoring is usually done in small groups rather than one-on-one instruction. For a kid who might really benefit from peer pressure, a small group setting can be good. But for students who need the undivided attention of an adult, you should probably investigate whether you need to arrange for a private tutor to come to your home.
That's the age when classes start to become departmentalized and this could be the first manifestation of learning differences, because now the child is going from class to class. You may be looking at a time management or organizational problem rather than a problem with the subject matter.