The second and third options will not help you succeed at school. Avoiding all extracurricular activities will give you more study time, but it will also cause you to burn out much faster. Also, extracurriculars actually help with time management, and more involvement will usually result in more structure, which will ensure that you carve out time to study and will be more productive during this time. You also don't want to treat your academics like a 9-5 job, because there are often scheduling conflicts that won't allow you to forget about academics after 5. For example, if you have a class at 7pm, this strategy will not be beneficial.
