Best Series 66 Exam Prep Courses of November 2025

Students who value getting their instruction from a company with a long history of building and improving its course offerings, Knopman Marks has spent over three decades erecting its reputation as one of the foremost FINRA exam prep companies. Founded by securities training expert Harvey Knopman, the company has trained hundreds of thousands of finance professionals—from Wall Street analysts to top-tier advisors.

What sets Knopman Marks apart is its unmatched depth of resources and flexibility in how students can engage with the material. For an entire year, students have access to a full suite of Series 66 study tools that includes, but is not limited to, a printed textbook, digital learning center, on-demand video lectures, detailed class notes, benchmark diagnostic exams, and a performance-tracking dashboard that adjusts based on progress. Students also get access to live virtual or in-person training that reinforces highly-tested topics and test-taking strategies in the final days before the exam.

Students can attend regularly scheduled live Q&A sessions or book one-on-one time with instructors—many of whom have real-world experience as investment professionals and are known for their clear, engaging teaching styles. For aspiring reps who want a structured, guided approach with every possible base covered, we found Knopman Marks to be the best overall Series 66 prep option available. Despite Knopman Marks’ powerful overall offering, the company’s lack of a money-back guarantee policy is worth noting.

Having served over a million candidates, Securities Training Corporation (STC) is another company that has a long history as a leader in exam preparation for various securities licenses. STC's Series 66 prep course is renowned for its robust study materials and flexible learning formats. The program includes a 12-chapter print and digital study manual aligned with the FINRA Series 66 content outline, on-demand video lectures, which total approximately six hours. It is also in synch with a variety of practice exams such as progress tests, final exams, and customizable quizzes. To reinforce key concepts, students have access to flashcards and "Crunch Time Facts," which are concise summaries designed for efficient review.

One of STC's standout features is its live instruction options. Students can participate in weekly one-hour Q&A sessions with experienced instructors, providing opportunities for clarification and guidance. Additionally, STC offers an instructor hotline for personalized support, ensuring that learners can get assistance as needed throughout their study process. It offers all of this and its popular STC Pass Guarantee. With its extensive resources, flexible learning options, and dedicated instructional support, STC's Series 66 prep course stands out as one of the most comprehensive programs available.

Designed for affordability and convenience, Study.com launched in 2002. Its mission Is to make quality education widely accessible. Accordingly, its Series 66 prep course is priced at just $60, offering exceptional value with unlimited access to digital learning materials. The course encompasses 142 online lessons, a whopping 710 practice questions, 20 practice exams, and 42 videos totaling four hours. This multi-format approach caters to various learning styles, ensuring that students can grasp complex concepts effectively.

By providing a rich array of study materials and access to abundant free materials—all at a competitive price— Study.com delivers exceptional value for people who are preparing for the Series 66 and other FINRA exams. Additionally, the platform's user-friendly interface and flexible access options make it convenient for learners to study at their own pace and on their own schedule. As an added benefit, students gain access to other FINRA-related courses under the same subscription, including the SIE and Series 6, 63, 65, 66, 24, and 79 exams.

Despite its affordability, the program does come with some limitations. Most notably, there’s no live instruction or instructor support—features that can be particularly helpful when tackling complex FINRA exams.

Kaplan is a widely recognized and trusted brand in financial education. Since 1938, it has earned that stature by improving its offering. Now, it has a reputation for high-quality test prep. Its Series 66 prep program is divided into three well-crafted tiers, tailored to meet the needs—and budgets—of a wide range of students.

The Basic package, priced at $209, is designed for self-starters. It includes a comprehensive exam manual and access to the SecuritiesPro QBank, which features unlimited, customizable practice exams that can be downloaded for offline study. A performance tracker and guided study plan help students stay organized and focused throughout their prep.

The next level of learning, the Essential package, costs $299 and adds a layer of structure through introductory and wrap-up videos, as well as midterm exams. For those looking for the most support, Kaplan’s Premium package really delivers. The $269 OnDemand option and $299 Live Online version include everything in the lower tiers, plus access to InstructorLink—a standout feature that connects students directly with expert instructors for extra guidance when needed.

Founded in 2016, Achievable is something of a new-comer to the exam prep space. Don’t let the company’s relative inexperience fool you, though. Achievable has rapidly gained recognition for its innovative approach to professional exam preparation that leverages adaptive learning technology to personalize study plans and enhance retention and efficiency.

Achievable also offers something that is completely unique among the companies we reviewed, and that is its online community that helps to foster collaboration among Series 66 candidates. Through its dedicated forums, learners can engage in discussions, share insights, and seek guidance from peers and instructors alike.

Complementing its community feature, Achievable offers a comprehensive suite of study materials. The platform includes an easy-to-understand online textbook, over 1,200 chapter quizzes and more than 26 full-length practice exams that mirror the actual Series 66 exam in format and difficulty. Additionally, the course provides 43+ explainer videos on key topics, catering to various learning styles. Achievable's adaptive learning engine continuously assesses performance, tailoring review sessions to focus on areas needing improvement, thereby optimizing study time.