The dice's order is consistent:
1, 4, 2, 6, 3, 5, repeat.
Try to hit the dice with melee, because if you hit the dice with any other attack, like Lady's guns or Vergil's Summoned Swords, the dice will give you a random number.
If you have a problem dealing with the Alto Angelo and 4 Bianco Angelos (the knights) in the first round, my advice is to not bother trying to fight them up close.
Keep running around and wait for them to gather to charge up a massive energy ball.
You can bounce the energy ball back at them with a Charged Shot (even at level 1) and it should kill them all.
Even if there are surviving Angelos, they'll be weakened and easy to defeat.