The holiday weekend is upon us, and students in North Central Florida are getting an extra day of vacation. But they're in for some changes when they head back to school because of the new class size restrictions that go into effect Tuesday. The tighter restrictions require a maximum of 18 students per class for kindergarten through 3rd grade, 22 for 4th through 8th graders, and 25 for 9th through 12th. Some schools with higher than expected enrollment will take teachers from schools with low enrollment. Marion County Public Schools may still have to hire dozens more teachers to comply with the new rules.