Students studying for the Series 7 in larger cities like New York or LA may find actual locations, but most find it easier to use a web based or video course online. A "crash course" should only be taken if you are already pre-studying with updated and quality training material. These include books and testing software. These are available through American Investment Training. AIT also provides other helpful links and an investment Glossary.
A typical class will cover near 40 hours worth of material. These can normally be paused or viewed as you have the time. The best part about an online setting is you can time it as close to your actual test date.
Available Crash Courses Online
You can view sample content and a full monthly schedule for upcoming classes. Easier for note taking and retention as you can't "pause" an actual person :) Price also is less than having to drive to a live course.
Best of luck on passing the Series 7. Know where the exam focuses on and be strong in those areas.