It is encouraged to go in sequence as it makes things more organized if you work with your manual from beginning to end sequentially. Nevertheless you may find that you want to jump around with the themes to correlate with school themes or for some other reason. You can do this with the Sube curriculum. What is important is that you note the words and phrases that will be introduced in that theme through the activities and tests and make sure to review, reinforce, and use them freely in the classroom as much as possible.