Spectrum is a comprehensive skill-building series designed to support students in developing strong foundations across core academic subjects. Covering key areas such as reading, writing, vocabulary, math, and test preparation, the Spectrum series features structured lessons, clear explanations, and abundant practice to help learners build confidence and mastery step by step. The carefully leveled books align with grade-level expectations and are widely used in schools and homeschooling environments. Spectrum’s systematic approach guides students through essential skills, helping them reinforce classroom learning while developing accuracy, fluency, and critical thinking.