I looked over the CCA175 page and while there is little mention of Hive or Avro one particular section stands out.
Exam Question Format
Each CCA question requires you to solve a particular scenario. In some cases, a tool such as Impala or Hive may be used. In other cases, coding is required. In order to speed up development time of Spark questions, a template is often provided that contains a skeleton of the solution, asking the candidate to fill in the missing lines with functional code. This template is written in either Scala or Python.
You are not required to use the template and may solve the scenario using a language you prefer. Be aware, however, that coding every problem from scratch may take more time than is allocated for the exam.
Perhaps you are looking at the exam as individual questions rather than tasks to complete. I would look over the required skills portion of that page and think about how you would accomplish each task. If Hive and Avro would be involved in your process to comlete a task, then prepare accordingly.
I hope this helps.
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