If you don't report for class, you need to make the following preparations yourself:
Familiar with the content of the exam: understand the questions of the provincial exam, the content and form of the interview, which can be understood by looking at the real questions or related materials over the years.
Systematic learning: Make a scientific preparation plan by yourself, including time planning, daily learning content and review progress.
Simulation exercise: Improve your test-taking ability and psychological quality through simulation exercise.
Self-evaluation: summarize your own learning situation and simulate your performance during the interview, find out the shortcomings and improve them.
In a word, the most important thing is to maintain self-confidence and unremitting efforts, whether you are applying for classes or preparing for exams yourself.