Over the past few months I've taken about 16 exams from the 50s-80s and even excluding the scores I got towards the start of my studying, it appears there is a significant gap in the average scores for my exams from the 50s/60s (avg. 172, max 176, min 170), and the 70s/80s (avg. 168, max 171, min 167).

The difference in my performance comes from the RC and LG sections, but I'm not sure why... Are there certain question types that have become more common in the more recent exams in both RC and LG? Any help figuring this out would be much appreciated. At the moment I'm just wishing I could have taken the exam a decade ago.