First: find a study method that suits you. Everybody has his own particular method to get the best from study sessions: you have to find yours, too. Try to understand whether you learn faster/better by passively reading materials or by applying concepts to a variety of examples; search for a note-taking system that awards your effort, that makes things you're learning solid in your mind. It's not easy, but it's worthy the effort.
Second: relate these things to one you like. Take a moment to think about how you can use the things you're going to study in your daily job situations. If they're somehow related to stuff you already know, it'll be easier to understand and maybe get yourself a little passionate about new topics.
Third: you must study that. why don't make it at your best? It's not something you're doing in your spare time. It's that kind of matter that can help you asking for a raise, that can make you have big progresses in your career. It's really worth the effort.