advance training; prior training
Training or orientation conducted before starting a job, activity, or event.
New employees receive advance training before joining the company.
Volunteers are required to undergo prior training.
研修 is general training or study, while 事前研修 specifically refers to training done in advance.
事前準備 is advance preparation in a broad sense, whereas 事前研修 is specifically training or instruction.
Compound of 事前 (beforehand) and 研修 (training, study).