I noticed a common question in the 'comments' area below Friday's lesson:
Can you suggest some websites for vocabulary, idioms and phrasal verbs for IELTS?
Here's another comment (written by shokhrukh) that answers this question:
I often wonder why so many people look for vocabulary websites when they have one right under their noses: ielts-simon.com. If you went through all the lessons Simon has posted over the years and picked up all the great words and phrases along the way, I'm sure you'd be well on your way to getting band 7+ in IELTS.
Obviously I agree with shokhrukh. I believe this website contains all the IELTS vocabulary that you need!