Can I drop a subject and pick up a new one?

I got sorted into Ravenclaw in Pottermore but in HOL its Gryffindor so after getting sorted into Gryffindor I again took the pottermore test and now it's saying that I'm in Gryffindor. I guess your personality changes with time??

My favourite creature is surely a hippogriff as the portrayal of them is just beautiful and I would love to ride one.
Another creature which I like very much is the Thestral. I know it's weird but I just feel they are so special and magical that it's beautiful

I personally don't want the sequel to come out as I think the the book is not a as splendid as the other books and frankly I don't want them to drag the story on as what Harry Potter is right now is enough. Even if the sequel is to come out I would not want it to follow Albus and Scorpius and Rose a...