I am so sorry you’re going through this. Scoring a 735 on an official mock only to see a 655 on the screen is a massive shock to the system, especially when you’ve put in the work and have a professional background in finance.
First, let’s breathe: A 655 is not a "bad" score. On the GMAT Focus Edition, a 655 is roughly the 90th percentile. The reason it feels bad is the "gap" between your potential and your result. That gap is almost certainly not about your intelligence or your Econ degree—it’s about the specific way the GMAT tests Quant under pressure.
Here is a breakdown of why this happens and how you can bridge that gap.
1. The "Harder Quant" Perception
You are not imagining things, but it’s likely not that the math is "harder" in terms of concepts. Instead, the actual exam often uses wordier prompts or more complex logic traps than the older mocks.
When you are stressed (especially after your first attempt had technical issues), your "executive function" takes a hit. On a mock at home, you might see through a trap in 10 seconds. In the center, that same trap can eat up 3 minutes of panic, leading to a death spiral in your pacing. Since you are in Corporate Finance, you likely have the "math" skills, but you might be relying too much on calculation rather than GMAT logic.
2. The Mock Exhaustion Trap
By the time you get to Mock 5 or 6, or if you retake Mocks 1 and 2, you may be experiencing "inflated" scores. Even if you don't remember the exact answer, your brain recognizes the pathway to the solution faster than it would on a fresh problem. This creates a false sense of security regarding your pacing.
3. The "Percentile" Mindset Shift
You mentioned feeling down about being in the 50th percentile for Quant. It is crucial to remember that the GMAT Focus Quant section is extremely top-heavy. Because the Focus Edition removed Geometry, the remaining pool (Arithmetic and Algebra) is much more competitive. Many people with high total scores have "lower" Quant percentiles because the scoring curve is very unforgiving at the top.
How to Proceed: A Tactical Plan
Acknowledge the "Hidden" Quant Gaps Since you've exhausted official mocks, you need fresh, high-quality "hard" problems. Look for "GMAT Club 700+ level" questions specifically for Data Sufficiency and Algebra. Do not just solve them; explain them out loud. If you can't explain the "shortcut" or the logic to a 10-year-old, you don't own the concept yet.
Master the "Art of Letting Go" In your next attempt, you must give yourself permission to "guess and move on" on at least two Quant questions. Often, students with finance backgrounds feel they should be able to solve every math problem. This pride is a trap. If you spend 4 minutes on one hard question, you sacrifice three easy ones later.
Re-engage with DI (Data Insights) Your DI dip from 85 to 81 suggests that Quant fatigue might be bleeding into your DI performance. Since DI is now a third of your score, you can’t treat it as an afterthought. Focus on "Multi-Source Reasoning" and "Graph Interpretation" where you can use your professional data-fluency to pick up points without heavy "math."
Simulate "Testing Friction" Since the computer restart traumatized your first attempt, your brain is now hyper-vigilant for things going wrong. To combat this, do your next few practice sets in a less-than-ideal environment (e.g., a noisy library or a different room) to build up mental stamina and "disruption immunity."
You are not alone
Many test-takers experience a "score drop" on the Focus Edition because the shorter format makes every single mistake count more heavily against your score. You have the Verbal skills (an 88 is incredible!) and the professional background to crush this. You are currently a high-performer who had a bad day at the office.