Google Classroom Information (old) Google Classroom Codes Click on the Links to the left for the subject you're looking for and find your classes Google Classroom Code. Remember you must be signed in to your Newark Public Schools Account to access your google classrooms. If you need help go here - To join a class with a class code Go to classroom.google.com. At the top, click Add Join class. Enter the class code your teacher gave you and click Join. A class code consists of 6 or 7 letters or numbers. For example, hjhmgrk or g5gdp1.