So for anime, 5 was the only one pre-10 I didn't know. EDIT: Oh the difficulty is not about the ordering, okay, I'm erasing the prior comments.
For VGM... I'm probably not a great judge. 2/5 are the only ones I can name perfectly, 4 I know what it's from, but that's a 50/50 for the game it's from for me normally. 3 I think I know the series, and 8 I have a weird guess for but I'm uncertain. That said, I don't have VGMC repertoire so take my knowledge with a grain of salt. The fact that I don't know 1 probably means I'm far from the type of person you're targeting.
So Anime I'd grade with about... 3/10. Of course I may say 4-5 if people are forced to name the shows and haven't watched anime for over a decade so have like 800 anime of knowledge.
VGM for me is like 9, but again, not the best judge.
I'll just go back to gifs. Not like the winner was gonna click my topic.
https://i.imgur.com/SXyi7uX.gifv