have you found out if the first chapter of year 8 gives house points? it shouldn't probably... but I'm not sure
I haven't managed to get past chapter 60 because the game was about to give me house points for my unfinisihed scavenger hunts / spellcasting in first person.
However, I have heard that in year 8 you have assignments that you need to complete as part of the story, and those will probably give you house points (or whatever the graduate equivalent of them are).