Larry Cohen is a very successful American bridge player and teacher. The quiz part of his site offers a huge range of quizzes broken down into six areas: Defense, 2/1 Game Force, Doubles, Bidding, Conventions and Declarer Play.
Check them out if you want to self-assess areas where you might want to invest some learning time. And rate the collection to help others.
Here are some that caught my eye:
- "Identifying end-all bidding situations" - when you should not bid again, period.