It could be both. Usually the problems categorized as "easy" tend to not have many tricks. Also, from what I have noticed the easy ones are usually the first 10 questions you would see in the LR section. The first 10 questions are also the questions which are on the easier side. From my personal experience the only thing which changed for me making a shift from easy to harder questions was the time I spent on the harder ones. Process is the same, if you follow the instructions from the lessons I am sure you would be fine with the harder ones too.