Another very very important tip :
- identify you motivation sources, your real sources of motivation : for example, mine are : (respect of) nature, music (hearing and learning violin), (learning) languages and culture (and their sovereignty), (seeing) girls.
- concentrate yourself on what you like, not on what you dislike : if there is be a link between one think you like and onn another think you dislike, if you concentrate yourself on your disliking, this last can take space on what you (did) like. For example, I did not like history. But I was very interested in cultures, so, seeing the evident link between history and cultures, I've become more interested in history (and in many others things).
- So, when you have to study something that you a priori dislike, try to feel/find/create the link between this thing and another thing that you like. When I teach mathematics to any student, I first ask him/her what he/she likes/loves doing.