Studies are an important part of learning to play an instrument. They help you to learn specific bits of technique by focusing on one thing at a time so you can concentrate on it without having to think about other aspects of technique at the same time.
I have developed a range of studies for my intermediate and advanced students which focus on a range of technical areas that I find many students encounter problems with. These are quite condensed so that you can concentrate on specific areas in a concise way to maximise the efficiency of your practice time. By using these in your practice routine daily you will gain the most from them.