PMI does not disclose the passing score for the CAPM certification exam; moreover, I have also gone through the CAPM handbook to find the passing score for the CAPM exam, but also no luck there.
It is a common perception that if you select correct answers for 61% of the questions, then you may pass the exam, but no one can guarantee the truthfulness of this claim.
Therefore, I suggest you aim for at least 70% in your CAPM certification exam; i.e. 105 questions out of 150 questions. Forget about the pretest questions because you cannot differentiate these questions from the rest. Therefore, consider all 150 questions as real test questions.
image credit => Stuart Miles / FreeDigitalPhotos.net