You have 168 hours each week and you must use each hour wisely. It is helpful to establish a schedule written on paper. In addition to classes, be sure to schedule a daily quiet time, worship, chapel, study time, eating, sleeping, and time for recreation. Learn how much sleep your body needs and plan your schedule accordingly. It is a good idea to get regular exercise, maybe 10 minutes per hour of studying.
Healthy foods are essential to maintaining a healthy body.
Seek to understand the concepts in the courses you are taking. Don't be lazy in working problems. Engineering students learn important concepts by working problems. Sometimes you will study alone and sometimes in a group. A quiet place is most effective.