According to the information released by official website of China Communication University, there is no strict requirement for the sound test of China Conservatory of Music. In other words, you can directly register for the corresponding level of examination according to your basic knowledge and skill level of music.

However, it should be noted that different levels of voice testing correspond to different difficulty requirements. If you choose to enter the college entrance examination directly, you may need to spend more time and energy to prepare. At the same time, the specific requirements and procedures of the examination may also change due to different regions and times. It is recommended to read the notice and requirements of the exam carefully before registration, or consult local music education institutions or professionals to obtain more accurate information.