Not sure what you are looking for here, but the concepts the first few weeks are generally not extremely difficult. I also think in general the concepts as a whole are not "that" difficult (of course there are some exceptions to this).
The difficulty in law school is (1) managing the workload and (2) learning how to apply the law and its ambiguities to many different situations. For the most part everyone in your class will know the law, differences in grades will come from the depth of analysis and seeing the "forks" in the road.