The Basic Plan only includes the core features of Classtime such as real-time data analysis, access to all question types, unlimited questions & sessions, and access to 50,000+ free questions.
To create and manage Classes, launch Collaborative Challenges, change default Session Settings, integrate Classtime to your Google Classroom, and more, you'll need to upgrade your account to a Premium plan. Check all the features available only for Premium plans and School License here.