The 1[State] Government may exempt, subject to such conditions as it may consider necessary, any workshop or workplace where a manufacturing process is carried on and which is attached to a public institution maintained for the purposes of education, 2[training research] or reformation, from all or any of the provisions of this Act:
Provided that no exemption shall be granted from the provisions relating to hours of work and holidays, unless the persons having the control of the institution submit for the approval of the 3[State] Government a scheme for the regulation of the hours of employment, intervals for meals and holidays of the persons employed in or attending the institution or who are inmates of the institution, and the 4[State] Government is satisfied that the provisions of the scheme are not less favourable than the corresponding provisions of this Act.