okay all you do is go to the bubble with 3 dots then click optitions. A screen wil apear and it will have game setups on it. go to the top bar and click 'game options' that way you can select how long your teen sim stays a teen sim. if you want your sim to go to the prom clicker I suggest you should click the teenage bar and raise it really low and then your sim will graduate and go to the prom quicker.
if this doesn't work please email jessietregg@hotmail.co.uk