(a) Beginning with teachers listed under § 6-1002(f)(3) of this subtitle, as specified by the State Board, a teacher on level one, two, or three of the career ladder shall:

(1) Teach in the classroom on average 60% of the teacher’s working time; and

(2) Spend the remaining time on other teacher activities, including:

(i) Improving instruction;

(ii) Identifying, working with, and tutoring students who need additional help;

(iii) Working with the most challenging students;

(iv) Working with students living in concentrated poverty; and

(v) Leading or participating in professional learning.

(b) (1) An assistant principal is on level three of the career ladder and shall:

(i) Be an NBC teacher; or

(ii) Have an advanced professional certificate for administration.

(2) Beginning with teachers listed under § 6-1002(f)(3) of this subtitle, as specified by the State Board, an assistant principal shall:

(i) Teach in the classroom for at least 20% of their working hours; and

(ii) Spend the remaining time on other teacher activities, including:

1. Setting priorities for the subject level departments of the school; and

2. Fulfilling specialized roles, such as head of professional development.