You need to pass the completion exam to get a certificate.
Tips
usage
结业 (complete a short course) vs. 毕业 (graduate from a full program). 结业考试 is typical for training classes (驾校 driving school, 英语培训 English courses, 公务员培训 civil-service training) — you get a 结业证书 rather than a 毕业证.
