David Oh
David Oh
Founder · Law School Applicant · Ex-Pharma R&D Scientist

Shouldn't it be at the center? MPEP wasn't just a 4,000-page rulebook, but the source. If exam's fact patterns represent the instances that would've shaped the rules I was tested on, it seemed obvious that I should know the book itself. Yet I was advised against it.

I wondered why. As I kept studying, I was frustrated to find how most study aids treat rules as facts to memorize, prioritizing isolated top-down delivery without touching the MPEP itself. Apparently, it was because the MPEP was difficult to navigate. Also, since the exam's PDF viewer often lagged and blocked Ctrl+F, studying with a modern PDF reader would actually hurt you.

"If you can't use Ctrl+F on the exam, you shouldn't use it during prep."

After spending weeks building the PDF viewer, I felt underprepared for the exam itself. I asked myself whether I should reschedule. When I sat at the Prometric Testing Center, however, I had already decided to give it my best; at the minimum, to validate my prototype against the real thing. That experience verified what I'd built was already high fidelity design—the lag, the blocked Ctrl+F, the interface. All of them.

Some people think I was misguided sitting for that exam, and more so when I decided to launch this platform before passing the bar myself. Yet I'm doing it because I believe in the value of what I've built, and because I am confident others will find value in it as well.

This platform is for college seniors entering the uncertain job market; for those studying after their 9 to 5; for those unsettled post layoffs—and for the many Reddit posters who anguished but generously shared their testing experience so others can better prepare.

Practice like you play. MPEP first.

Dec 2025
Finishing up law school applications. Signed up for PLI.
Jan 2026
"As I said, we can't get ours to work as slowly as they do theirs."
PLI instructor, during one lecture while referring to MPEP navigation
Jan 13
Registered for the exam. No platform existed yet.
Feb 20
Found the Prometric tutorial of the exam interface. Reddit post pointing to Prometric MPEP demo
Feb 21 – Mar 5
Formalized development plans. Decided to treat the exam as R&D.
Mar 6 – 22
PDF viewer, lag simulator, exam interface with questions—platform built. PDF Viewer with Prometric-accurate interface, March 22
Mar 23
R&D week at Prometric. The interface matched. Fidelity confirmed.
Mar 26 – Apr 4
Law school tour. Still building.
Apr 12
patentbarfidelity.com goes live.
Apr 17 – 18
Released PDF viewer as a free, standalone product.