One thing that was helpful for us was learning about a curriculum style called a rotating curriculum. This is a system that allows everyone in a class to work on the same material at the same time, so class can be more focused and organized, and people get more attention to their material.
What we did was we broke our color belt classes down into beginner, intermediate, and advanced level classes. In each level, students are all learning the same form, kicks, sparring drills, basic techniques, etc for a few months. Then we have a test. Everyone who tests and passes gets a new belt. Everyone who doesn't, they stay the same rank. Then the whole class moves on to learning another form and set of material. Once they've tested 3 times, they can move up to the next level of classes.
With this system, students might learn the material "in the wrong order" - but how much does "the order" really matter? If they learn Taegeuk 5, then 3, then 4 - they've still learned all three forms.
You can also break your monthly class schedule down into different themed weeks. Some places, for example, will alternate between "A week" and "B week", where one week they might focus on forms and self-defense techniques, and the next week they do kicks and sparring. That kind of planning helps to make sure that students will see all the different elements of your curriculum on a regular basis.