Students normally enter La Salle High School as Freshmen. STS testing, grammar school transcripts, written evaluations and a personal interview are among the criteria evaluated by the Admissions Board. High School transcripts, written evaluations and a personal interview form the basis for evaluating students applying for other grade levels. 

Certain required courses must be completed at La Salle High School during the normal school year. These include the required courses offered in Religious Studies, English, Social Studies, Mathematics and Science. While summer courses at other institutions may not be used to complete these core courses ahead of schedule, summer courses in these areas may be used to make up for deficiencies already recorded on the transcript. Courses completed prior to the first semester of ninth grade may not be applied toward graduation units or requirements.