Failing the exam once will be dismissed, unless there is a clear agreement in the contract. Otherwise, if, according to the law, the laborer is not competent for the job and is still incompetent after being trained or adjusted, the employer may terminate the labor contract after notifying the laborer in writing 30 days in advance or paying the laborer an extra month's salary.

Article 40 of the Labor Contract Law: In any of the following circumstances, the employer may terminate the labor contract after notifying the employee in writing 30 days in advance or paying the employee an extra month's salary:

(1) The employee is sick or injured non-work-related, and cannot engage in the original job or other jobs arranged by the employer after the prescribed medical treatment period expires;

(two) the laborer is not competent for the job, and he is still not competent for the job after training or adjusting his post;

(3) The objective conditions on which the labor contract was concluded have changed greatly, which makes it impossible to perform the labor contract, and the employer and the employee cannot reach an agreement on changing the contents of the labor contract through consultation.