As a current Oregon State student, you won't need to apply for summer term. Register for summer classes the same way you do for other terms by using the MyOregonState portal; there is no priority registration. The vast majority of on-campus courses are accelerated, meaning you're able to complete standard term length courses in less time. Many students utilize these unique offerings to get ahead on coursework and lighten credit loads during the academic year, or to complete sequences (in subjects like Chemistry or a foreign language), where three terms worth of courses can be completed during the summer term. Work with your academic advisor to formulate the best plan for your individual success.