All UAC numbers for NSW students are the BOS number with a 1 at the front (making 9 digits)
However, on initial application they ask for your BOS student number (8 digits), which should be on your various notices from them. For example, my BOS number is 1381 and my UAC number is
11381.
Look for any letters from BOS or UAC, or your year 11 Record of Achievement. You should find your BOS Student number there.
If you're looking for your Pin and can't find the letter, call the UAC office RIGHT NOW. The number is in the UAC guide and on their
website
(800th post)