Yes you can. Each test type (Car, Motorcycle, etc) offers options to take a short test, a full test, or to practice questions by topic. When you select Practice questions by topic, a list of all available topics is displayed. Click to select the topic you want to study and you'll see options to take a short test for that topic, a full test, or you can answer questions in a topic singly. Each question you answer correctly in a topic is notated with a check mark, so you can easily track your progress.