Harry Potter and the Order of the Phoenix Q&A

I've performed all the tasks but I'm stuck at the giffendor common room.i,ve realeased the snitch but the game doesn't seem to move forward.what is to be done

when you do the battle how can you beat the 3 death eaters when you only have harry and sirius.
it is IMPOSSIBLE OR IS THERE A CHEAT PLZ ANSWER

How do i beat the three deatheaters (after Draco's father when i can only ues Harry and Sirous) in the Miniatry of Magic?

How do you save

i have all gobstones, choco frogs, and cards and im just missing 1 snitch and i cant find it anywhere

i did all the quests for the people but now i am stuck at the common room quest when i go there nothing happens or there's no 1 who i can talk to

what do you do at the verry end after voldemorte?

How can I win the duel?