Wonder if your test takes one or two days and if your going for the usual rep test. Your last game of the regular year was probably the second or third week of december so you should be somewhat still in playing shape if you had kept working out. Full evaluation camp's are usually held in the spring so this is probably the coaches way of tweaking every players training program and see what he needs to work on before spring drills. Just do your regular workouts, too late to change much now. Bring along a jar of raw honey or some of those sports drinks with the extra kick to them. Carb load in the morning with a whole grain breakfast.
All in all, just about every player thinks these test are a waste of time and energy. There probably right, proves very little as to the true potentional ofa player and what shape he's in. I played Divison I for four years so I know where your coming from. Good Luck.