Good classroom organization means:
A - making clear to children exactly what is expected of them in the way of getting out or putting away apparatus and equipment before they start to do it
B - Children know where things are kept and they each have clear duties and responsibilities, both to deal with the normal running of the classroom and with the sudden emergencies when things get split or broken.
C - Planning lessons carefully so that the practical activities are within the scope and the competence of both teacher and class and never threaten to get out of hand.
D - A well-organized lesson with adequate material carefully prepared and with all equipment to hand and in good working order is way better than one that even the teacher concedes bears a certain resemblance to a shambles.