As long as you don't report to class, you can take the fair exam and you don't have to report to class.
If you sign up for class, you will be more knowledgeable, grateful for information, and have more psychological comfort, but you will also spend more.
Before, I didn't report to class, but I found my own books, bought my own books and endorsed my own exams. Didn't they all pass?
This kind of thing absolutely depends on our own ability, and others can't help it.