My students have always loved these summary booklets. This series of booklets, which I am starting to upload, have definitely had a massive impact on their grades.
This one covers <i>sets and Venn diagrams</i> (helpful for GCSE, but extends to cover the IGCSE syllabus too).
This particular booklet is detailed enough to use for teaching as well as for revision. I print it as an A4 booklet and use for three lessons and a homework for full coverage of this topic. Feel free to use just the questions for either work in class or for homework.