Barron’s Educational Apps offers seven free Android apps for practicing mathematics, science, grammar, and spelling skills. These apps are designed to correspond to Barron’s series of Painless books like Painless Pre-Algebra. While Barron’s would love for you to buy their books, you can use these apps without buying the books.
I tried two of Barron’s Educational Android apps; Painless Grammar and Painless Pre-Algebra. Both of the apps offer three games and three quizzes. In order to access the games students have to score 80% or better on the practice quiz.
The other apps available from Barron’s cover Algebra, Earth Science, Chemistry, Spanish, and Spelling. According to Barron’s these apps are intended for middle school and high school students.