Take the Series 66 if you have (or are getting) a Series 7 — it combines the Series 63 and 65 into one shorter exam. Take the Series 65 if you won't hold a Series 7: it stands alone with no prerequisite and no sponsor, which is why it's the standard route for independent advisers and career changers. Both qualify you as an Investment Adviser Representative (IAR).
Both exams are written by NASAA (the North American Securities Administrators Association) and administered by FINRA, and both lead to the same destination: registration as an Investment Adviser Representative. The difference is the path.
The Series 65 is the standalone IAR exam. It requires no sponsor, no prior exam, and no securities job. Because it must qualify people who may have zero industry background, it covers the full base of knowledge: economics, investment vehicle characteristics, client recommendations, and law.
The Series 66 merges the Series 63 (state agent law) and Series 65 into one exam — but it only works alongside a valid Series 7. NASAA strips out most of the product and analysis content (the Series 7 already tested it) and concentrates on what's left: law, regulation, and ethics.
| Series 65 | Series 66 | |
|---|---|---|
| Scored questions | 130 (+10 unscored) | 100 (+10 unscored) |
| Time limit | 180 minutes | 150 minutes |
| Passing score | 92 of 130 (~70%) | 73 of 100 (73%) |
| Fee | $187 | $177 |
| Prerequisite | None | Series 7 (co-requisite) |
| Sponsor needed | No | No (but 7 requires one) |
| Replaces | — | Series 63 + Series 65 |
| Heaviest content | Products, analysis, strategy | Law & ethics (~half the exam) |
Question-for-question, most candidates report the Series 66 feels harder: nearly half the exam is law, regulation, and ethics — the material with the most lookalike rules, exemption traps, and "best answer" judgment calls — and the 73% passing bar is slightly higher than the 65's. The Series 65 spreads its difficulty across more territory: you'll face economics, portfolio theory, and product questions the 66 largely skips, across 30 more scored questions and 30 more minutes in the chair.
The practical framing: the 66 is a narrower, sharper exam that assumes Series 7 knowledge. The 65 is a broader, longer exam that assumes nothing. If you've recently passed the Series 7, the 66 is genuinely less total study time. If you haven't, the 66's "advantage" disappears — you'd have to pass the 7 too.
Take the Series 66. One exam covers your state agent registration and IAR qualification. Taking the 63 and 65 separately would mean two fees, two study cycles, and substantial overlap.
Take the Series 65. No firm, no sponsor, no prerequisite. This is the single exam that stands between you and IAR registration.
You may not need either — most states waive the Series 65 for holders of these designations. Confirm with your state securities regulator before paying for an exam you can skip.
Both exams punish recognition-level knowledge. NASAA questions routinely swap one word in a rule — "may" for "must," an adviser for an agent, a state exemption for a federal one — and the wrong answers are written to feel right. The fix is the same for both: retrieval practice on exam-style questions, spaced repetition timed to when you're about to forget, and immediate correction of every miss.
Trelos is built entirely around those techniques for both the Series 65 and Series 66. It teaches each concept, drills it the way NASAA tests it, and schedules reviews so the rules stick — weighted toward the law-and-ethics material where these exams are won or lost.
Start the Series 65 or 66 on Trelos — freeNo credit card. Feel the retention engine work in your first session.