What you study is more important than how you study. Students are subordinate to materials, much like novice cooks are subordinate to recipes. If you select the wrong material, the wrong textbook, the wrong group of words, it doesn't matter how much (or how well) you study. It doesn't matter how good your teacher is. One must find the highest-frequency material. Material beats method.
Timothy Ferriss, The 4-Hour Chef: The Simple Path to Cooking Like a Pro, Learning Anything, and Living the Good Life
learning, material, selection