You should not analyze the questions you got wrong according to their level of difficulty. It really does not make sense because questions cannot be properly differentiated just by level of difficulty.
You can review more comprehensively by checking what concepts is tested on the questions that you mostly got wrong.
For example, In RC are you getting the primary purpose question correctly? Is detail question getting you those crosses on the review screen?
Check them out.
We will be happy to help once you have sorted your weaknesses.
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