It is not necessary for students to memorize the advanced phonograms, though it is helpful to become familiar with them.
By the time students have learned the 75 Basic Phonograms, they will have developed an understanding of the principle of letters and combinations of letters representing sounds within words. Without direct instruction, most students who have completed Essentials or Foundations will be able to recognize an Advanced Phonogram they encounter in a word and deduce that it is an Advanced Phonogram without difficulty.
However, many students will also benefit from knowing the origins and additional information included on the Advanced Phonogram Flash Cards. Becoming familiar with advanced phonograms makes it easier to learn the spelling of words that include them and provides students with clues about the origin and pronunciation of unknown words.