Weight / Fat loss

Ok. My BMR is 2102.2. I do quite alot of exercise so if I multiple that by around 1.5 that gives me around 3000 calories.

If i eat 2500 calories per day then how much weight will i lose in that timeframe? A pound a week?

id really suggest using something like myfitnesspal plug in 2100 -400 as your daily calorie target, then when you do exercise use it to calculate what extra you burn off rather than a randomly selected number, id guess loosing about 1/2 kg per week is pretty achievable as an average over 6 weeks. which would get you pretty close to your target, then just go for a run/sauna to dehydrate yourself just before the weigh in if you think they'll be that strict.

I did a skydive at 100kg back when i was proper man weight...