The 40s are very misleading: LG and RCs are a lot easier and LRs tend to use the same tricks over and over. The 50s and 60s should be fine though but I think LGs in the 80s are more time consuming (more brute-forcing your way through) if not harder.
The 80's are very different. The lawgic is trickier and less definitive. Granted, the task is still the same. But in the 40s-50s, there was usually one clearly right answer and four clearly wrong answers. Now the right answers tend to be less clear, while there still being four clearly wrong answers.
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The 40s are very misleading: LG and RCs are a lot easier and LRs tend to use the same tricks over and over. The 50s and 60s should be fine though but I think LGs in the 80s are more time consuming (more brute-forcing your way through) if not harder.
For me there has been quite a difference between the 60s(No difference between the 50s and the 60s) and the 70s……...
The 80's are very different. The lawgic is trickier and less definitive. Granted, the task is still the same. But in the 40s-50s, there was usually one clearly right answer and four clearly wrong answers. Now the right answers tend to be less clear, while there still being four clearly wrong answers.