Make things interesting. Logical arguments will not give you motivation to study. Thinking that if I study hard and get into a good university and get a good job, etc., will not interest you. Love what you do. Try to find the beauty of every subject, and most importantly try to link it with the events of your life and things that interest you. This linking may be conscious (ie. performing chemical reactions, physical experiments or manual mathematics calculations in order to prove a formula) or unconscious (eg. You go to the park and look at the leaves. Then you think to yourself, Hmm, let me review the parts of the leaf we learned in bio class last week). Even though this might not sound the most ideal method for theoretical subjects such as English, use your creativity to make stuff up. For example try to write a story with all subjects starting with S, all objects starting with O, and no verbs containing V.
Find a good study spot. You should feel comfortable, but not so comfortable that you risk falling asleep--a bed isn't a very good study spot when you're tired! The place where you study should be relatively quiet (traffic outside your window and quiet library conversations are fine, but interrupting siblings and music blasting in the next room are not).
As far as music is concerned, that's up to you. Some people prefer silence, others prefer music in the background. If you belong to the latter group, stick to instrumental music (music that has no words like classical, soundtrack, trance, baroque ) and that you're already familiar with (not something that's bound to distract you)--otherwise, your brain will "multi-task" and not be able to retain information as well.
Having the television on while you study is generally a bad idea. It can distract you a lot and suck all of the things you've studied out by making you focused on the show that is on.
RAPHEL