Selection examination is a highly competitive examination, and applying for a training class can improve the preparation effect, but it is not necessary. Whether to enroll in a training class depends on your own needs and conditions. Here are some suggestions for your reference:

1. Self-assessment: First, know your learning ability, time and energy input. If you think you have enough time and ability to teach yourself and master the knowledge and skills needed for the exam, you don't have to enroll in the training class.

2. Features of the training course: Understand the course content, teaching quality and teaching staff of the training course. High-quality training courses can provide targeted counseling and improve learning efficiency. If you think training courses can help you master knowledge and skills faster, it is a good choice to sign up for training courses.

3. Application conditions: Applying for a training course may require some economic investment. You need to weigh your financial situation to ensure that after paying for the training course, it will not affect other life and academic investment.

4. Advantages and disadvantages of self-taught examination and training courses: self-taught examination can cultivate independent learning ability and independent thinking ability, but it may face limitations in learning resources, guidance and communication. Training courses can provide systematic teaching and answering questions, but may lead to higher learning costs and dependence.

5. Consult experienced candidates: Understanding the experience and suggestions of other candidates applying for training courses can help you make a better decision.

In short, applying for training courses depends on personal needs, learning ability and economic conditions. When making a decision, please fully understand yourself and the training class in order to make a wise choice.