IPA: /ˌpriː.kəˈlɛdʒ.i.ət/
KK: /priˈkɒlɪdʒɪt/
Relating to the period or education that occurs before attending college.
Many students take precollegiate courses to prepare for higher education.
Precollegiate → It is formed from "pre-" (meaning before) and "collegiate" (from Latin "collegium", meaning a society or group). The word "precollegiate" refers to the period or level of education that occurs before attending college.
Think of 'pre-' meaning 'before' and 'collegiate' relating to college — so precollegiate refers to the education that happens before college.