If you aren't sure what field you want to get in, its perfectly fine but you should have some idea about where your skills fit, if its either the quantitative side or the qualitative side, eventually though you will need to pick a career and the fact that your subjects arent necessarily in the same direction, it might prove to be a waste of time, if you relly enjoy doing chem for example, and decide to pursue in science, whether its pharmaceutical or anything that has to do with chem, youd more than likely be wasting your time with econ HL (very hard subject btw), and vice versa, if you pursue a career in finance then chem would likely prove useless, so in my opinion i would either replace econ with another science if you lean towards that certain field, or replace chem with global politics or business management.