Usual interview type stuff, turn up clean, tidy plain polo, work boots combats etc all fine have hiviz, and pair of gloves, remember things like ask them to check your brake lights.
As a new pass they are not going to expect you to know everything, and remember you do not know everything so ask questions and listen to what they say, drive like your test, but if you need to say go over a kerb a bit because of some numpty parking/ in the way etc, just say dont think im getting around here without x going over the kerb…they might say nah just wait for them to bloody shift, or say yeah crack on. they just want to make sure before they hand you keys, you are not going to squash anybody, damaging their gear, company image or cause them issues with calls saying XXXX is a bloody loony