Learning Needs to Be Difficult
Many, maybe even most, students rely on ineffective strategies for learning new material. This is an easy mistake to make because it stems from a key conflict in learning. When people choose a learning method, they tend to assume that the ones that feel the easiest are the most effective. This isn't unique to learning, either: consider the number of times we search for the shortest or fastest route somewhere, or the proliferation of hacks for pretty much everything.
Just because a learning strategy feels easy in the moment does not mean that you will be able to demonstrate your learning later, though. Effective learning, the kind of learning that allows you to understand complex material or recall information later on, requires deep processing, and methods for deep processing tend to take more effort and feel more challenging. We're drawn to simplicity and ease (i.e., shallow learning methods), but the difficulty is what helps us learn.