1. A method of presenting exercises of a literacy system, comprising: presenting to a student a set of pre-reading exercises selected from a group consisting sequencing exercises and letter writing exercises; presenting to the student a first level of language skills exercises that introduce a first set of content words and non-content words in a first combination of exercises to collectively teach all four of the language skills of phonology, semantics, syntax, and text; presenting to the student a second level of language skills exercises that integrate the first set of content words and non-content words with a second set of content words and non-content words in a second combination of exercises to collectively teach all four of the language skills of phonology, semantics, syntax, and text; and presenting to the student a third level of language skills exercises that integrate the first and second sets of content words and non-content words with a third set of content words and non-content words in a third combination of exercises to collectively teach all four of the language skills of phonology, semantics, syntax, and text.