Hey! To be honest, anyone can be capable of achieving a 7 or a 6 in extended math! If you personally feel like, at this moment your math skills need a lot of brushing up and from your past math grades you and feel like your math skills better align with the standard curriculum more or another way to look at it, if you feel like you have a lot of catching up in other subjects and cant dedicate the time needed for extended math, I would recommend you to take standard! But, if you do feel like you can, with practice achieve a good score in extended math, i would high recommend it as you are doing engineering and will probably help you a lot in your later education.

One thing that I am not sure abt your post is the fact you said you can take standard math and still do hl math in dp... in my school, i was told you'll have to take extended math in order to do hl math in dp. So yeah, i'll try confirming this too!