Books and digital aids are common in the learning process. When books are owned by the school, you’ll not be able to use color coding as a learning strategy. However, that is against the purpose of learning: you do not go to school to make sure the teaching material looks unused, but to take in the subject matter! So feel free to ask for copies of the texts so that you can use them in a way that helps you. When going through a text, it may be helpful to highlight certain words or parts of the text using colors. …