little brian and mom/order of the phoenix... HELP

Hi I got an answer but cant find it here.Anyway we were at 94% of the game until little brian decided to press the wrong thingie of the game and he had to start all over again...I havent touched the game till now, but he is stuck is also liking the "fighting and letting harry's enemies stand on their heads" but we need to finish the game...He hasnt gotten the highest grades..we cant get into Hagrids house....all the portrets are hanging,ghots are free, so what else??? I really cant find what we can do to finish the game as the "fighting" is starting to irritate me...we really have done everything i can think of...written cheats down...we still cant play chess...and the other game with the stupid balls on the court yard.
Who can help a mum from going nuts, we still have so many games to play but i want to teach him to finish a game..which he doesnt mind...
I realize now to get the highest U GRADE you have to do other stuff first, Brian found some plants in the greenery and immediately his grade went up from stupid to fair,or moderate..whatever...so I NEED HELP...where can I look,what can I do...HELP...PLEASE...
Greetings Brian and mom Karen