Well, I'm not the strongest guy on here, or even within the top 20, but I'll just state the obvious here - eat like crazy. You have to be eating at least 3000 calories per day, and plenty of protein/carbs with a good amount of fat too (I'm not an expert on what your target macros should be, except that 1.5-2.0g protein per lb. of bodyweight is generally a good rule for trying to stimulate growth.)

But that's about all I'll throw out there, since there are plenty of guys here who know loads more about bench competitions than I do. But definitely make sure you're eating enough.

Good luck with the contest!