\version "2.18.2"

\book {
  
 \markuplist \table-of-contents
 
  \score {
    \tocItem \markup test1.1
    \layout {}
    \midi {}
  }
  \score {
    \tocItem \markup test1.2
    \layout {}
    \midi {}
  }
  \score {
    \tocItem \markup test1.3
    \layout {}
    \midi {}
  }
}

\pageBreak

\book {
  
 \markuplist \table-of-contents
 
  \score {
    \tocItem \markup test2.1
    \layout {}
    \midi {}
  }
  \score {
    \tocItem \markup test2.2
    \layout {}
    \midi {}
  }
  \score {
    \tocItem \markup test2.3
    \layout {}
    \midi {}
  }
}