Maths is so much easier than physics so unless you REALLY need physics dont do it, i regret doing it myself tbh its so hard, got consistent D's in every test this year except for my mock which i worked my ass off for and managed to get 1 off a B i was so happy, but with maths i didn't revise as hard and was 2 off an A for my mock,
Basically, if you NEED physics do it, if you can do maths instead, do that.