also, there are random numbers that will determine the dmg (if it's not a jutsu or atk with 100% accuracy)
if the random number is 9/12, and the higher the better, the dmg does 3/4 as normal (75%). some jutsu's like projectile shuriken jutsu, require a minimum percentage, like 20% of total.
for the chuunin to host battles, here are the jutsu you need to know to calculate
projectile shuriken jutsu (random number = 20, needs 20 %)
projectile kunai jutsu (random number = 20, needs 20 %)
fire/water/lightning/wind jutsu lvl 1 (random number = 30, needs 75 %)
fire/water/lightning/wind jutsu lvl 2 (random number = 40, needs 70 %)
fireball jutsu (random number = 50, needs 67.5 %)
ninja tool summoning (random number = 45, needs 90 %)
ask me on any others you need help with.