Does the subject want to ask, "Is there no signature on the self-taught commitment letter that affects the exam?" It didn't work. According to official website, a self-taught examination network in China, the letter of commitment only serves to inform the candidates of the self-taught examination, and forgetting to write the signature and date has no effect on the results of the self-taught examination. Higher education self-study examination, referred to as self-study examination and self-study examination, is divided into social candidates and application candidates.