Which subject should I drop?

[CurtisJ]

Hi, sorry if this doesn’t make a whole lot of sense, but I’m currently at the end of yr 11 and I’m doing 14 units but will need to drop to 12 or 13 units as there are too many units for me to focus on.
I would like to go into an engineering or medical field and am aiming for a 97 or above atar.
The two subjects I’m tossing up between are PDHPE, which I like and am going very well in, and extension 1 English which I also like too, and going okay in too.

My subjects currently are:
- Maths advanced
- Maths extension 1
-  Physics
- Chemistry
- Engineering studies (accelerated)
- PDHPE
- English advanced
- English extension 1

But basically I’d like to use the time of dropping one of the subjects, to focus on chemistry or extension maths, while also not compromising scaling + marks. I was told that an extension subject is about the same amount of work as a 2 unit subject. Any thoughts or help would be greatly appreciated! Thank you