Answer:
true.
Step-by-step explanation:
Preparation is, indeed, the key to success in any form of exam. Even in an open book test, one needs to be prepared, that is to say, one needs to know and understand the contents of the bibliographical resources allowed in the exam and the topics covered in class so that when one arrives at the test, one is acquainted with different possible answers that will need to be elaborated in due time and form.