I always think smart casual is
shoes, not trainers
trousers or jeans that fit and don't have holes (fashion holes or otherwise!)
a shirt or polo shirt, basically something with a collar
TOP TIPS.
on your way into the building, turn your phone off (not silence it etc.) actually turn it off, put it in an inside pocket out of the way.
leave it alone for the entire time you are in the building.
you can turn it back on when you exit the building at the end of the assessment.
It will do you no harm to be disconnected from all distractions whilst you are there, also you will be assessed constantly from the moment you arrive to the moment you leave, not just when they sit you down and ask you to do things etc.
Be polite and courteous, you don't know but the door you held open for that person could make a difference if it turns out to be the director of training or the Managing directors mistress.
It is not unusual for hiring managers to ask the receptionist what they thought of a candidate, remember anyone in the building could possibly black ball your application if you are impolite to them.
If you have to wait for someone or something, don't be tempted to get your phone out.
have a look at the posters, leaflets, notice boards etc. read them and try to absorb some of the info.
later on, maybe there will be a time when they ask you if you have any questions.
instead of a stock answer they have heard from 70% of the candidates, it is much better if you can ask something relevant.
such as, I read on your noticeboard that you have a 5 a side team, is it open to anyone?
try to come across as keen on learning instead of telling people how good you are and what you already know.
in 10 years time, you will look back at yourself and realise that you knew nothing.
p.s. that is not an attack on you, more an observation that most of us make later in life when we look back.
Best of luck, and I hope some of the above helps.
