There are plenty of different options when it comes to finding synonyms for the phrase "required readings." You could try using terms like mandatory texts, prescribed materials, essential literature, or necessary course materials. Another option might be to focus on the specific content being studied, such as referring to primary sources, critical texts, foundational works, or foundational readings. Some other possibilities might include using words like compulsory texts, recommended literature, key resources, or essential texts. Ultimately, the best synonym for "required readings" will depend on the particular context and the subject matter being studied, but there are many options available for those looking to add some variety to their vocabulary.