I recently started doing Flex PTs after doing regular ones for most of my prep. I feel that your strategy makes a lot of sense for learning the content, but in order to get down the timing I wanted to perfectly mimic the testing conditions. Maybe that is dumb, but I've noticed the 15 minute gap is really a blessing in the regular test that you have to account for not being there in the FLEX.

AC C on the Timed and AC A on the BR. I am sorry logical tutor JY, I have failed you...

The mere fact that the stimulus contains nothing about the relationship described in C is the reason that it is wrong. Nowhere does the stimulus express that "if high-achieving, competitive parents were to be more child-centered....anything" the passage just doesn't mention anything about it, let alone that it would result in less/more aggression.