You can't really do anything about it since there's only a few
days left. But here's what you can try to do
1. Work out in the gym. Doing barbell squats in the gym
for strength and explosive power.. standing/seated calf raise helps
too. Spread your work out to say, 1 training day and 2 off day. Oh,
and don't forget your lunges too.
2. Diet.. Stick to protein rich foods, and cosume about 250g -
350g of good carbs a day depending on your body weight (boneless
chicken breast, flax seeds, oats, green lentils and salmons, and
don't forget your greens. It helps you build muscles and
strength.
3. Drink more water before your IPPT.. You won't be able to
perform if you're not properly hydrated.
4. Keep jumping and try to get your techniques right.