Unfortunately this isn't necessarily something that is consistent across global offices - e.g. some offices still only have PST, some have PST + online test (e.g. London), some have neither...
Your best bet is to either ask people applying to same office as you or to message HR for any kind of sample they can provide.
Second thing that comes up in a google search...
You can try MyOfferPrep for that.
All the best,