Is physics the hardest school subject?

I certainly remember when I was at school I found physics harder than most other subjects, perhaps harder than the rest totally.

I can't fully remember why but I just have a vague memory of not quite understanding some of it and therefore having to learn the answers rather than really understanding them in many places.

Is physics the hardest school subject and if so what can be done to make it more interesting for pupils to encourage them to persist?

I seem to remember that I didn't find it particularly interesting at the time but not many years later I realise how fascinating it is, and if that had been communicated to me at the time I would have been more likely to stick with it!