At the end of the day the VCE and ENTERs and all that are just a numbers, they aren't a reflection of whether or not a person will be successful in the future. There are many different ways and different paths to take. In other words, it's not the end of the world if you don't get the score you want, the sun will come up the next day.
Other than that, as long as they try their best, that's all you can ask.
As for me, when I was doing year twelve, I wish I had have put in a little more effort, rather than just coast through.
Year 12 goes so fast, so you need to be organised.
And yet another one: Balance is a key as well. You can't study all the time, you need to have some releases.
Just some ramblings..