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This web and mobile app goes a long way toward helping you memorize characters, vocabulary, and phrases.
Sounds of Speech (University of Iowa)
This phonetics website gives a comprehensive understanding of how American English speech sounds are formed, including videos, audio samples and animations describing the essential features of the consonants and vowels.
GED practice tests
Sample tests in math, language arts, social studies, and science. The tests are 1/4 the size of the actual GED.