Enrollment expansion is organized and implemented by provinces according to different situations, but there is one of the enrollment conditions, that is, college students who have obtained higher education (including adult education, online education and open education) or college entrance examination graduates who have been admitted to colleges and universities and retained their enrollment qualifications cannot participate in the enrollment expansion of higher vocational colleges.
You have already taken the adult junior college exam and are in the second year of high school, that is, you already have an adult education degree, so according to the requirements, you can't participate in the enrollment expansion of higher vocational colleges.
In fact, the reason is very simple, because the diploma obtained by the expansion of higher vocational education is a full-time unified college diploma, which is the same as the diploma of students admitted to the college entrance examination, and its gold content in society is higher than that of adult education. If students who participate in adult education are enrolled, then all the tens of millions of students who participate in the centennial plan will enroll for enrollment expansion, and education without academic qualifications will not be lost. This is obviously not allowed and impossible.