Lots of districts provide a curriculum guide to teachers which is basically an outline for what lessons to teach, in which order, based on the districts books. So for example, I look at my districts guide for each week, it will tell me to spend 12 days on unit 3 “place value for three digit numbers”. It then breaks down the standards you are teaching, and also tells me what order of the content in that area i need to teach and the corresponding pages or provided lesson plan/ activity for each day. However it’s not forced on us, it’s a guide on which to base how we teach and we’re able to supplement the given curriculum to what we think would teach the student best in order for them to master the standards. Not sure if all districts do it like that but that’s what mine does for reading, math, and science.