I did Singapore from pre-k until 1b. I switched to math mammoth to help supplement it because she wasn't retaining anything. I redid 1st grade after the Saxon placement test. She did Saxon 1,2,3, intermediate, then 5/4. She has been struggling through 5/4 for over a year. She watching the video, then I help her complete the practice problems and examples. She cries through the mixed practice. I correct it and I work the problems she got wrong with her.