The best way to ovecome the problem of mood is to set your study schedule by the week instead of by the day; for example, you can decide to study for 10 hours this week, or for 6 days this week, instead of tying yourself down to, say,Tuesday mornings from 10-11 a.m., for when Tuesday comes you may not be in the mood. This way, you study at any time of day, and on any day that you want to, as long as you have met the 10 hours, or the 6 days, by the end of the week. Normally, it is best to study at the same time each day to form the habit, but if you know what your moods are like, then you can use this method of setting the number of hours by the week instead of daily, and you will feel better knowing that you accomplished your goals.