1. There is no academic system for self-study exams (except full-time self-study exams). The specific time depends on your own learning progress. General junior college students have 2.5-3 years and undergraduate students have 3-4 years.

Two, about the validity of the certificate of single subject:

1, not all provinces and cities implement the 8-year validity period of single-subject certificates.

As far as I know, Beijing, Shanghai, Fujian, Shandong, Jiangsu, Hebei, Zhejiang, Xinjiang, Guangdong, Hubei, Sichuan and Hunan have not implemented this regulation. The provinces and cities that have been implemented are Tianjin (implemented in 2000), Heilongjiang (implemented in 2006), Shaanxi (implemented in 2006), Jiangxi (implemented in 2005), Liaoning (implemented in 2004) and Henan (implemented in 2003).

3. The calculation method is as follows: there are new candidates and old candidates, and the qualified scores of old candidates are counted from the time limit of eight years in the province. Push forward for eight years, not the date of his license.

4. Consult the local self-study department for the specific situation of your province. (mainly whether it is implemented and the date when it starts to be implemented)