DD sat this year's NVR for woodford. There were 4 sections of 18-19 multiple choice questions. Total of 75 questions in 39 mins. From what I understand, this format varies from year to year. Chn are not allowed to write on the question paper.
Try this link to read Redbridge's Official Guidance on the 11+ selection procedures:
At least 10 high-flying chn from her school sat the test. All agreed that the test was phenomenally hard. But don't be put off. Read as much as you can on this site. There are lots of very handy snippets of info on this forum, which together will help you to build up a picture of the whole process and what it entails, although it does take some time and patience to find them. Good luck!