Gotta disagree on that one. Muscular endurance and ORM are different things (red vs white muscel fibers).
If you want to increase the number of times you can bench 225 I woudl do the following things:
1) Practice benching 225 as many times as you can.
2) Find the weight you can bench 30 times. Add 5-10lbs to the bar each week. If you fail, keep going with that weight (in susequent workouts) until you get 30, then go up again. Either that or just use the same weight and continue to add reps. It may help psychologically to be doing heavy weight for mroe than 30 reps so that when it comes time to do 225 for 30 it that's not the most reps you ever do on bench press. On the other hand if you are used to doing 30 reps every time, when you are at 28 with 225 you may have the psychological advantage of being used to doing 2 more reps every bench workout.
I would also eat and sleep my ass off.
My first instinct would be to say to do both 1) and 2) once a week (say on Mondays and Thursdays) but how your body and CNS react will have to guide you.
As far as supplements, definitley creatine and on the day of the test soem kind of CNS stimulant. But beware caffeine and creatine work against each other so up the creatine dosage and take it immediately before the workout.