I review, refresh and sometimes completely restructure the resources on geographyalltheway.com as I teach the content to my students. I have just finished covering the Freshwater unit with my DP1 students so if you haven’t checked out that unit recently, it maybe worth a look.
Unit 1 will be next for my attention. My Higher Level students are currently on Unit 5 - so that is getting a polish as we work through it.