Be comfortable but not too comfortable. Sitting at a desk or table is preferable to lying in bed. Use the same place for studying. This will help you associate that location with studying and will facilitate concentration. Try to find a quiet, well-lit area.
Many schedules fail because of a lack of flexibility.
Students tend to over-schedule themselves. Allot time for planned recreation, campus and church activities, and so forth. Schedule your flexible time commitments and recreational activities around the fixed activities. When forced to deviate from this schedule, trade time with another event. For example, if something unexpected arises during study time, substitute an equal amount of study time during a scheduled recreation period.