no, dont take subjcets youre not confortable with. especially if you know what you want to do at uni. the IB is a lot of stress and assignments and long hours, if youre not good at maths and sciences, just take studies and ESS. in the end, few courses at uni (that are not stem or econ and stuff) require maths SL and any other science than ESS. but if you want to do law or any other humanity, just go for it! i graduated the IB in 2017 so i know quite a bit about it. PM me if you need anything else!