You've clearly put in real work here, and quitting your job to study full time is a serious commitment, so let me give you an honest read rather than a rosy one.
Start with the premise, because it matters. Covering 85% of the syllabus is not the same as having mastered it, and your own numbers tell the story. Missing roughly a quarter of medium Verbal questions and close to a third of medium Quant questions is the signal worth paying attention to. A 725+ score requires answering hard questions correctly and consistently, and at that error rate on medium questions, the content underneath isn't solid yet. More questions alone won't close that gap. The questions have to be paired with going back and learning the underlying concepts deeply enough that the medium ones stop slipping.
Going from 555 to 725+ is a 170-point jump to a top-tier score, and 20 days (even full time) isn't enough to close a gap that size. A move like that from the mid-500s usually takes months of focused mastery work, not weeks. I'm not saying this to discourage you. I'm saying it because the worst outcome is grinding for 20 days, sitting the exam underprepared, and burning a test attempt on a score that doesn't reflect what you're capable of with more time.
So here's what I'd do with the 20 days. Go back to the topics where your misses cluster, relearn the concepts and techniques thoroughly, then practice that one topic untimed until your accuracy is consistently high. For every question you get wrong, figure out exactly why: was it a concept you didn't really know, a misread, a trap answer you fell for, or a genuine careless slip? Most often at this stage the cause is that the underlying content isn't solid yet, and naming the specific reason is where the improvement comes from, because it tells you what to fix. Then redo the questions you missed, from scratch, a few days later to confirm the fix held. Only once a topic feels routine should you add timing, and timing is a confirmation step, not the fix. Speed comes from the depth of the learning, not from forcing the clock.
A couple of weeks of that kind of work will move your accuracy meaningfully. What it probably won't do is take you all the way to 725+. So let your practice data, not the calendar, decide when you sit. Near the end of your sprint, take a fresh official practice test to see where you actually stand now, since 555 was your starting point and you've put in a couple of months since. If your accuracy on medium and hard questions is consistently high and the mock reflects it, go ahead and sit. If it doesn't, push the date and keep building. A score you're proud of on a later date beats a rushed one you'll have to retake.
This article walks through how to practice for mastery, which is the lever that will move your score the most:
The Best GMAT Practice MethodsJumboCrew
Hi guys
I have been studying for gmat since past 2.5 months along with my job done with atleast 85% of the syllabus now im quitting my job for prep and will have 20 days to study full time...initially my score was 555 in mock amd i aim for a 725+ however during my current practices in both verbal and quant i see quite a few mistakes ( say 25% for verbal and 30% for quant for medium level questions)
Can anyone please help me in how to boost my score