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The RTL English Learning System offers a transformative step-by-step method of study with 5 developmentally appropriate stages, 15 series of increasing difficulty, and over 500 step-by-step lessons. RTL English will give your child a head start, or help them catch up. It also challenges more advanced students. RTL English offers 15 years of learning for children aged 3 to 18 years old; so whatever your child's ability, there's sure to be an RTL English workbook that's suitable for them. For over 26 years, RTL English has been taught millions of times to children in 21 countries worldwide.