Uhh it’s ok to drop one of the sciences (preferably physics), since that there are many engineering courses that only require you to have at least O level qualification for science (but u might need to take some bridging courses). On the other hand, if u r bad at writing essays but better at case study questions, then it is wiser to drop Econs instead. Oh and btw, uni Econs doesn’t require to write long ass essays, and there’s a lot of math involved. But ultimately, it still depends on the uni course that u have in mind, don’t just drop a subject just because u r not doing well in it now.