Together with the Series 7, the Series 66 qualifies you to act as both an agent (a securities salesperson) and an investment adviser representative. It's a corequisite, so you need the Series 7 as well, but you can pass the two in either order. Formally it's the Uniform Combined State Law Examination, administered under NASAA.
You get 150 minutes for 100 scored questions plus 10 unscored pretest items, 110 in all, and the passing score is 73%, meaning 73 of the 100 scored questions.
Unlike the Series 7, it isn't a product-knowledge test. It leans on state law, ethics, fiduciary duty and the rules for how you advise and transact for clients. If you can keep the definitions straight (what makes someone an investment adviser versus a broker-dealer, an agent versus an IAR) and you know the standard of care each one owes a client, you're most of the way there.
Format and the four domains
The questions are single-best-answer multiple choice, and there's no formula sheet. The pretest items are scattered in and unmarked, so give every question the same care. 150 minutes for 110 questions is roughly 80 seconds each, which is comfortable if you've practiced and tight if you're reading each stem for the first time. Don't park on a single hard item.
NASAA's content outline has four domains:
| Domain | Weight | What it covers |
|---|---|---|
| Economic Factors and Business Information | 8% | Macroeconomics, business cycles, financial reporting basics, quantitative methods |
| Investment Vehicle Characteristics | 17% | Equity, fixed income, pooled vehicles, derivatives, insurance-based products, alternatives |
| Client Investment Recommendations and Strategies | 30% | Suitability, portfolio construction, tax considerations, retirement and estate planning basics, turning a client profile into a recommendation |
| Laws, Regulations, and Guidelines, including Prohibition on Unethical Business Practices | 45% | State registration of firms and individuals, the Uniform Securities Act, exemptions, recordkeeping, fiduciary duty, disclosure, prohibited conduct |
The law and client domains together are three quarters of the test. Economics is a small slice, and much of the investment vehicle material overlaps with the Series 7. I see people over-study product mechanics they already know from the Series 7 and under-study the regulatory material that's being tested.
How long to study
Plan on 40 to 60 hours of focused study. Where you fall depends on how recently you passed the Series 7 and how comfortable you are reading legal-style material. A three to five week plan works for most people studying alongside a job:
- Week 1: laws and regulations, part one. Registration of broker-dealers, agents, investment advisers and IARs: who must register, who's excluded and who's exempt. Get the definitions solid before you move on.
- Week 2: laws and regulations, part two, plus ethics. The Uniform Securities Act, state authority, recordkeeping, fiduciary duty and the long list of prohibited and unethical practices, which is where the fact patterns come from.
- Week 3: client recommendations and strategies. Suitability, risk, taxation, retirement accounts and portfolio basics. Tie every product back to when it is and isn't right for a client.
- Week 4: investment vehicles and economic factors. Move faster here if your Series 7 is fresh and focus on gaps.
- Week 5: full-length practice and review. Mixed timed sets, error review and work on your two weakest domains.
If you're studying full time, you can compress this to two or three weeks, but keep the mixed practice at the end.
Working questions, and the usual mistakes
Early in my own exams, I'd reread a chapter and think I knew it because it looked familiar. After the first pass, rereading teaches you very little and won't build the pattern recognition the exam needs, so most of your time should go to working questions.
- Learn a topic, then drill it right away with 20 to 30 questions while it's fresh. Read every explanation, including the ones for questions you got right.
- Keep an error log. Write down what each question tested and why you missed it: a definition, a threshold, a fiduciary standard or a careless read.
- Move to mixed sets once you've covered all four domains. Real exam questions come in random order, and recognizing what a question is testing is a skill worth practicing.
- Do at least two or three full-length timed runs so the 150-minute pace feels normal.
- Build a buffer. Passing is 73%, so work up to a consistent 80% or better on fresh mixed sets before you schedule. That margin covers exam-day nerves and oddly worded items.
You can build that error log and hit your mixed-set targets with free questions in the FreeFellow Series 66 question bank, without paying for a course.
The most common mistake is treating the Series 66 like a second Series 7 and drilling products, when the regulatory and ethics material is by far the largest domain. The next is blurring the definitions. Investment adviser versus broker-dealer, agent versus IAR, and the exclusions and exemptions for each come up constantly. Know the fiduciary duty advisers owe and how it differs from the conduct standards for agents, since fact patterns hinge on it.
You don't need a perfect score, either. Once you're consistently in the low 80s on mixed sets, schedule the exam instead of grinding indefinitely. Check the current content outline before your test date, because weightings and administrative details can change.