Thinking of why you chose to study this subject, and where does it lead you - in your life, yeah - to the depth of it...might bring you more to focus, to a feeling of fulfillment
You chose it because you LOVE it and because you have natural inclinations for it. Try to recall....

I know there are things in what you love that you hate....but in the end..it is that inside reward we get that matters. They when you base your deeds on it - your concentration improves because you are more one with the whole study things.