Section 33. Except as otherwise provided in this chapter and subject to any laws which limit the amount of money that may be appropriated in any city for school purposes, the school committee, in addition to the powers and duties conferred and imposed by law on school committees, may provide, when necessary, temporary accommodations for school purposes, may make all repairs, the expenditures for which are made from the regular appropriation for the school department, shall have control of all school buildings and grounds connected therewith and shall make all reasonable rules and regulations, consistent with law, for the management of the public schools of the city and for conducting the business of the committee.