No person shall be dismissed or reduced in compensation,
(a) if he is or shall be under tenure of office, position or employment during good behavior and efficiency in the public school system of the state, or
(b) if he is or shall be under tenure of office, position or employment during good behavior and efficiency as a supervisor, teacher or in any other teaching capacity in the Marie H. Katzenbach school for the deaf, or in any other educational institution conducted under the supervision of the commissioner;
except for inefficiency, incapacity, unbecoming conduct, or other just cause, and then only after a hearing held pursuant to this subarticle, by the commissioner, or a person appointed by him to act in his behalf, after a written charge or charges, of the cause or causes of complaint, shall have been preferred against such person, signed by the person or persons making the same, who may or may not be a member or members of a board of education, and filed and proceeded upon as in this subarticle provided.
Nothing in this section shall prevent the reduction of the number of any such persons holding such offices, positions or employments under the conditions and with the effect provided by law.