RAC tickets are priority over WL tickets. And have very good chance of getting confirmed ticket.
But in the mean time Please go to PNR forum,
Click it ,
go to write ten digit PNR no.
click...
more... 'PNR prediction/analysis' button.
and you get a text box where prewritten text is available. if you want to add something more please write. and click 'post blog' button.
This completes the formality and your PNR prediciton has started. you observe its progress till your journey day.