You can choose several doors at a time, or you can not choose them.
As long as you have completed all the 10 exams before the election.
The subjects will be selected by the general school.
Otherwise, some subjects can't keep up with the progress and won't let you take the exam.
And you can only choose this subject as an elective subject if you reach E or above in your academic exam.
scientific popularization
Zhejiang provincial academic level examination
The purpose of the Academic Proficiency Test for Ordinary Senior High Schools (hereinafter referred to as "Academic Proficiency Test") is to further accelerate the construction of the quality monitoring system for ordinary senior high schools, promote the effective implementation of curriculum reform in ordinary senior high schools, and comprehensively improve the quality of education and teaching. Combined with the actual development of ordinary high schools in Zhejiang Province, on the basis of careful investigation and argumentation and extensive solicitation of opinions from all parties, the corresponding examinations are formulated and organized. Zhejiang senior high school entrance examination 20 13 officially ended. On this basis, in 20 13, Zhejiang province implemented the academic proficiency examination system for the first time.