First of all, the PE is the licensing exam US engineers sit to put "P.E." after their name. Eight hours, computer-based, open to one reference — the NCEES Handbook. Passing changes what you're legally allowed to sign. What got me building was a pattern I kept seeing in candidate forums: people drill a practice bank until they're scoring 80–90% on it, sit the exam, and meet problems they've never seen. They hadn't learned the method — they'd learned that bank. The sets are finite, and finite sets get memorized. So CastorPrep is built the other way around: • Original problems. Every problem is written for this bank — not lifted from the Handbook or another publisher's set. There's nothing to memorize your way through. • A grounded AI tutor on every problem. Castor doesn't freestyle: it works from that problem's verified worked solution and cites the Handbook section you'd use on exam day. That last part matters more than it sounds — a good part of the skill on an open-reference exam is knowing where to look, fast. • Full-length 8-hour mocks, with a pace report afterward. Pace is what separates people who know the material from people who finish, and it's the one thing a problem set on its own can't teach you. What it isn't: a course. It won't teach you thermodynamics from scratch. It's the practice-and-rehearsal layer — use it alongside a course or on your own. PE Mechanical is live today. 7 days free, no card: https://castorprep.com Happy to answer anything. And a genuine question for anyone here who's sat a licensing exam of any kind — bar, PE, CPA, medical boards: what actually moved the needle for you in the last month of prep? I've got my own answer from the forums, but I'd rather hear yours.

CastorPrep

Exam-real practice and a AI tutor for NCEES PE exams.

Exam-real practice and a AI tutor for NCEES PE exams.