You should try different studying techniques for yourself and see if they work or not. If it does work then set yourself a timetable to get yourself more organised so you know what you should be doing at times of the day.
For example, try to study for hourly increments starting at ten or nine o'clock with half an hourly or an hourly breaks. You should determine for yourself which one suits you, ie. which one do you allows you to get the most work done in the amount of time and still not 'burn out'.