If I was you I would get the ppl airlines at the moment are not sponsoring and may not for a few years yet.
As for maths and physics you will use both in groundschool mainly maths with a bit of simple physics as for on the job some simple maths and I have never used any physics at all, once you get up to speed doing the job it's like any other job it gets easier, and it's well worth it so much fun.