Living Math

Hi just wondering if anyone had used the SCM Living Math and what grade level would that be considered. I have a sixth grader that is struggling in all subjects to be at grade level. He’s more of a fourth grade level.

Also, I’m using Queens language lessons along with spelling wisdom so I’m wondering if that is enough for language arts since it covers Narration, Copywork, and dictation? Spelling wisdom would be for spelling

Thanks!