I doubt the format has changed much this year as it has been the same for some time.
There are two sections, the first is a pattern related test, start of easy and get increasingly difficult. 9 boxes in a 3 x 3 grid with one blank and you have to select the missing one from a list, trying doing a few on-line IQ tests that involve shape and pattern questins to get into the mind set.
The next section will be an essay, generally on yourself, interests and so on. When i did it a few years ago I drew a complete blank in the essay and wasted a bit of time. So it might be worth it to do a practice run the night before.
I don’t know if the test are over yet, but i doubt it as they normally run for the full week.