GED Exercise Books Complete practice for the GED Satellite Program Complete coverage of all tested subject areas offer the most accurate preparation available with test-practice and developmental lessons. Extensive visual stimulants develop graphic literacy and critical-thinking skills. Multiple activities and practice exercises help students assess their progress and boost confidence. Testing and record keeping throughout assesses strengths and weaknesses, targets instructional needs, and builds student confidence. Answer keys and indexes allow students to check their own work while learning from their mistakes. Test 3: Science Current issues in environment and ecology, genetics, and nutrition encourage critical thinking, visual data interpretation, and basic science concepts. More than 100 GED practice questions are included.