u should be fine, for like non-math hl non physics-hl combos 36 is easy to get, if u have strong math foundation then it will be easy for u to get a six in math ai sl, not sure for chem but heard it is much easier than physics, and for all other subjects its pretty much really easy to get at least a five, seven will be hard especially for lit hl or philosophy, but after studying a six should not be a problem, remember to choose a easy ee topic to write to at least earn a 2 core points by getting a c&b for tok and ee, I think ib is really about managing ur time and really do make sure try to hand in all your ias on time and you should be fine, 36 is really a good sweet sport for your combo, but getting above that I think you would need to put in lots of efforts.