GMAT 665 — 545 to 665 — with e-GMAT

Strengths:

Data Insights: from 53rd to 97th percentile
DI went from a DI76 to a DI84, and in percentile terms from the 53rd to the 97th — a 44-percentile leap that took it from my joint-weakest area to one of my strongest. The single biggest reason was the DI course itself, which is simply the most comprehensive I came across. No other course I looked at offers Data Insights preparation anywhere near this depth.
What makes it work is how it splits the content. DI questions pull from two very different skill sets, and the course separates them cleanly — the math-based concepts on one side, the non-math, reasoning-and-reading concepts on the other — so you build each one deliberately instead of hoping they come together. On top of that, every single question felt new; the course kept exposing me to a genuinely wide variety of question types and formats. By the time I sat the real exam, the DI section felt like territory I already knew, because I had already seen and practised that range of question styles.

Would make the product better:

Quant: a big jump built on question quality
Quant climbed from a Q76 to a Q84, and the engine behind it was the quality of the Scholaranium questions. They are genuinely tough and closely mirror the difficulty of the real exam, so training on them meant nothing on test day caught me off guard. Instead of practising on easier questions and hoping they would scale up, I was working at the level the actual GMAT demands, which is exactly what a strong Quant score needs.

Verbal: a repeatable method that raised my floor
Verbal improved from a V79 to a V81, and what changed my approach was the pre-thinking methodology in the Critical Reasoning and Reading Comprehension courses. Instead of reading an argument and jumping straight to the options, pre-thinking trains you to work out what you are actually looking for first, then evaluate the choices against that. It made my reasoning far more deliberate and far less dependent on gut feel, which is what a consistent Verbal score really comes down to.
The data analytics that guided all of it
Underneath every section was the data analytics, and it is what kept my prep honest. It tracks your performance down to the question type and the difficulty level, so instead of guessing where I was weak, I could see exactly which areas were costing me points and aim my study time there. That precision is what let me turn a broad 120-point climb into targeted, section-by-section gains rather than scattered effort.
A few other things that mattered
Beyond the headline features, a handful of smaller things added up. The course structure builds each topic in order and makes sure you have actually understood one concept before moving to the next. The sheer variety and volume of practice meant I rarely saw a repeat, so I was always being tested rather than memorising. And the whole platform ties practice, analytics, and review together, so every question I did fed back into knowing what to work on next.
If I had to sum it up: the Data Insights course alone would have been worth it, but paired with high-quality Quant practice, a real method for Verbal, and analytics that tell you the truth about where you stand, e-GMAT is what took me from a 545 to a 665.