With a range of questions on each of the book's chapter, and a detailed explanation for each answer.
Build your knowledge, test yourself, review your favourites and fix those wrong answers.
In hard mode, questions that you got wrong recently will have higher chances to be selected in the test.
Review your wrong answers and better memorise the correct ones.
Track your performance on the tests and questions.
Identify your weak areas by reviewing your performance for each of the book's chapters.