You have picked IPT, meaning you have already picked a subject that focuses on technology. Whether you want a deeper technological perspective (which you can gain by taking both IPT and SDD) is something you should consider, should you wish to take both subjects. However, considering you have other career aspirations in addition to IT, I would not recommend taking SDD as doing so will prevent you from gaining other perspectives relevant to your other career aspirations.
Since becoming an actuary is also one of your career aspirations, and considering the fact that you haven't taken/listed Economics along with your other options, I would recommend taking Business Studies because it's a subject that allows you to build a foundation of knowledge related to different areas of business, including concepts that are linked to finance/accounting/economics.
This leaves us with your engineering career aspiration and two subjects, Engineering Studies and Physics. One thing you may wish to consider with respect to those 2 subjects is scaling, with Physics scaling relatively better when compared to Engineering Studies. Another important thing to consider is which subject you feel you would be more interested in/can perform better at. Perhaps you could recall whether your experience in year 10 science was good and whether or not you want to try something new, allowing you to make a more informed decision.
I hope this helps!
