There are several reasons why taking a course before an exam can be beneficial.

Structure: A course provides a structured learning environment that can help you stay on track and cover all the necessary material before the exam.

Expertise: Courses are often taught by experts in the field who can provide valuable insights and answer any questions you may have.

Practice: Most courses include practice problems and quizzes that can help you test your understanding of the material and identify any areas where you need to focus more.

Support: Many courses include a community of students who can provide support and motivation as you prepare for the exam.

Efficiency: A course can help you learn the material more efficiently than self-study alone, allowing you to spend more time on the things that are most important.

Increased chances of success: By going through a course, you will be better prepared for the exam and have a greater chance of passing it.

Overall, taking a course before an exam can help you learn the material more effectively, stay motivated, and increase your chances of success.