Take into consideration your whole schedule e.g. Swop job, family duties, extracurricular responsibilities when planning your schedule. Don't get over loaded with extracurricular activities no matter how interesting or attractive they sound. Budget your time wisely. Read all questions carefully and survey the test. Use of alcohol only masks the symptoms of stress and it adds more problems such as hangovers, traffic violations, fights, and trouble with school authorities.
Illegal drugs cause more stress too.
They put your physical and mental health at risk, as well as leading to possible arrest and expulsion from school. Recognize situations that cause stress for you and develop effective ways to manage it. Seek help if necessary to manage your stress.