Motivation means having a desire to do something. Motivate yourself. Only self-motivation works. To be motivated you first of all need to know exactly what you want to get from your study. To be motivated, you also need to appreciate the value of learning the thing to be learned. If you are highly interested in learning a subject you have to be highly motivated. The more highly you are motivated, the better and faster you will learn.
For good motivation it is desirable to understand the over-all objective of an assignment as well as to have in mind immediate, specific objective. For good motivation you must feel that the assignment before you is very important. We are most interested in learning things that we clearly recognize are important to us.