This app will give you dozens of arithmetic exercises: addition, subtraction, multiplication, and division. You don't necessarily need to answer correctly to progress, either. Instead, RekenTest stores your answers and evaluates your performance at the end of the test, identifying errors and the time you spent on each problem.
RekenTest can analyze your progress, too, and can generate random tests to focus on what's most difficult for you. You can also choose the difficulty of the test, its duration, the difficulty of the numbers, the amount of decimals, and more.