I don't know.
If you think the prospect of earning $50K P/A after drowning yourself in a $200K debt, and having that meagre income slashed in half due to salary sacrifice, all the while being entrusted with the controls of a domestic airliner, is a viable proposition, then go right ahead.
That is of course if there is a job waiting for you at the end of training? If not, then maybe you can beat your own chest about something.
We all have start somewhere, but I'm sorry my friend, the Jetstar Cadetship is the most shortsighted, cynical and evil scheme ever to come from the minds of the too clever by half been-counter brigade.
Join it at your peril