It's always good to have a list of your III students in your lesson plan folder. Your principal will from time to time as for your list of students which should change throughout the year. This list will also serve as a recorded of the students that have made progress throughout the year.
How to get TPT credit to use on future purchases:
Go to My TPT, then My Purchases. Beside each purchase you'll see a Provide Feedback button. When you click it and you will be taken to a page where you can give a rating and provide a short comment about the product that may be helpful to other customers. Each time you give feedback, TPT gives you credits that you use to pay for future TPT purchases. I value your feedback enables me to create great new products!