I’m kind of in the same boat as you. I’m in 12th grade (my last year of high school before uni, which I think would still be sixth form) and I didn’t really like the book when I read it in 11th grade. I have to read it again for a different class this year, and I was able to pick up on a few more subtle things.

A lot of people say it gets a lot better each time they read it, so I guess I’ll have to take their word for it.

The book is kind of weird because you can’t take it super seriously but also have to look at it through a bunch of different lenses (new historical, biographical, Marxist, feminist, etc) to really get the big picture. Whether that’s a good or bad thing is up to you, because it may get to a point where people are finding symbols that don’t really exist.