There are some people I know that took 2 goes to get thru sim training, they dont want you to fail. They do go the extra mile normally to help you pass and give many extra hours in the sim if needed or put you with a line pilot to hold your hand thru the sims if needed (there is always one of us who has hit high time and cant fly the line) .
There is also the option if you are marginal at passing the final gates and being put on OPT, which means a 6 month sim check instead of the normal 12 mth. Once you show them you have attained the standard you are put on the normal 12 mth sim checks ..or CQ sessions.