This is certainly not credible. You just need to download an APP on your mobile phone, as well as various driving test books and so on. Practice more, do several sets of questions every day, and you will basically understand the questions in a week. One subject and four subjects are still very simple. The most important thing is to practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice, practice.