Hey I'm going to uni this year. From my experience, if you're looking at a good university. Physics SL won't cut it. Only Physics HL, and taking Physics HL also gives you advantage as you are more likely to be picked. For engineering Maths HL and Physics HL are much better, Maths Sl might be accepted, but its better both HL. Maths HL is basically required for Applied Mathematics so physics SL can cut it for Applied Maths. Just remember one thing though, there are tons, and I mean tons of online resources to help you with Maths and Physics.