As a student, I can add ready-made exercise sets from publishers using an activation code. Such activation codes are specific to certain teaching materials and carry certain parameters (e.g. duration, how often I can redeem the codes, etc.). The activation codes can be purchased in various places (directly from the publisher, from a merchant, potentially from your school, or from Distrinova).
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Students can then enter the activation codes to unlock the collections of questions at this link:

Classtime has partnerships with numerous publishers, such as Careum, KLV Westermann, Compendio, and others. You will find collections of exercises from these publishers that you can use directly in Classtime.