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Hello Phil, Excellent question! Actually, we are currently working on developing study plans that make it clear when is best to watch each additional video lesson. There are two groups of video lessons in this section: 1. Watch the five 'formal / informal' lessons after you have completed all of the Intermediate Grammar modules because these lessons review the use of important Intermediate structures in context. 2. Watch each 'Phrasal Verb' lesson after the corresponding lesson in the Intermediate Conversation category before taking the test because they review the exact content of each lesson. Let me know if I've answered your question.