Chemistry vs Economics (IAL)Watch
So you should choose which to drop, if you absolutely need to focus, 3 great A results would be better than four Ds.
A level chem I found easy, until I got to detailed rate equations, bit lost, then all of organic chem, threw me further astray! So much to memorise. A level Economics, I considered a bit lightweight, compared to my physics experience anyway, but others on TSR have pointed out that it’s a useful and can be enjoyable A level; an introduction to business/accounting/finance/economics/politics etc
So use the A level explorer, simulate a few different choices and see where you get, then ask some trusted elders for their opinion & take your own fact based decision.