Need serious advice about my subject choices.

Hey r/IBO users!

I'm nearing the end of my first IB semester, and currently my subjects are Math/Chem/Econ HL and Phys/EngL&L/Mandarin B SL.

I'm a very math-inclined person (as in Math HL is not a struggle in the slightest right now, not to brag or anything), and I do want to keep all my subjects right now the same as nothing else really interests me, however I'm concerned about whether or not I should change the level at which I am taking these subjects.

My two main concerns about choosing IB subjects are 1) They can help me get into a good university (wishful thinking says Stanford/MIT) for a Computer Science related course and 2) They are manageable.

First and foremost, is it any advantage to take 4 HLs?

If not, I currently want to juggle around Physics, Chem, and Econ and take 2 of them at HL and the other at SL. I figured that Physics HL would be the hardest of the 3, however now I'm doubting this because the switch from Econ SL to HL is not purely Math and actually includes a lot of added concepts, which I genuinely did not know at the beginning. I also saw a post that said taking Physics is a large boost if I'm planning to go to CS in college, however I'm not sure if the jump from Physics SL to HL would have a great impact as the post didn't really clarify.

Considering my desired course and my proficiency in Math, can anyone give me sound advice on what to do? Hopefully I can switch subjects before the second semester.

Thanks a bunch guys :)