It happens, but don't get caught up thinking that any PT after 65 is harder because there's a change in RC. Instead focus on how to approach those RC passages. And you will see that soon you will be back to scoring you target score.
... 50+ and then starting from 65+, there is another shift. For ... the 65+ shift - there are more strengthen ... PLENTY OF TIME for the 65+ tests - to study them well ...