This paper explores new methods for tracking learning growth using curriculum-embedded assessments. The key objective of the study was to examine new ways to capture students' performance data to help make ecologically-valid inferences about what learners know and can do long before benchmark or end-of-year assessments. Student learning outcomes are examined through the use of embedded assessments and learning growth mapping. A study of 450,934 students finds that continuous engagement with essential skills on an educational technology platform, BrainPOP, is strongly associated with statistically significant increases in learning gains in Literacy/English Language Arts, Math and Science. Educators might consider using embedded assessments to gain access to and provide early feedback for students. By identifying gaps in students' knowledge, teachers can offer timely support to their most vulnerable students.