You say this as if both are equally bad - I just ran through it at ended up with 18/30 myself - but they list that as being in the 80/90th percentile! Or in their words: "You performed better than 80%-90% of 40,200+ candidates who took the same quiz."
AFAI can tell time doesn't enter into the evaluation, (ed: I did fairly rush through in 19 minutes - don't think it matters for scoring).
At any rate, I think you're conflating two things that people often conflate: suitability to get a job as a Software Developer/Software Architect - and Computer Science. If you want to do algorithmic research, you will need a good handle on CS - but for many development jobs a deep CS foundation is only a bonus, not a requirement.
Get more CS if you want to do research, get more programming experience if you want to work in this industry.
FWIW I know many great SWEs that have less of a CS background than what you already have.