A lot of learners assume a high HSK score proves they can speak Chinese. It does not — because the HSK never tests speaking. Speaking is a completely separate exam: the HSKK. If you are applying for a scholarship or a Chinese-taught program, you may well need both.
What the HSKK is
HSKK stands for Hanyu Shuiping Kouyu Kaoshi (汉语水平口语考试) — the spoken counterpart to the HSK. It is an independent exam: separate registration, separate test session, separate certificate. A strong HSK 5 result says nothing about your speaking certification; for that you sit the HSKK.
Crucially, the HSKK is delivered by audio recording. There is no examiner sitting across from you. You hear or read a prompt, get preparation time, and record your answer into a microphone. Many people find this less nerve-wracking than a live interview — but it also means you must manage your own pace and fill silences yourself.