Try and get rid of all distractions, and make sure you feel as comfortable and able to focus as possible. For some people, this may mean almost complete silence, for others, background music helps. Some of us need everything completely tidy and organized in order to concentrate, while others thrive in a more cluttered environment. Think about what works for you, and take the time to get it right
Get together with friends for a study session. You may have questions that they have the answers to and vice versa. As long as you make sure you stay focused on the topic for an agreed amount of time, this can be one of the most effective ways to challenge yourself.
Develop a schedule for day to day tasks that you want to do. This will help you remember different things that you need to do and make sure that you accomplish everything that you wanted to finish. This also helps you maintain and train your mind to remember things better even without a schedule.
Also, you should make sure to schedule for future events such as tests or quizzes. This way you will always be able to stay on top of your work and be able to easily remember what you need to work on during certain days of the week. This can allow you to better plan when you study and how much you study in increments.