Things you wished you had known about the 11 plus process
The main thing is that they're ALL different, so you need to ignore any stereotypes you may have heard.
A super selective in London is a VERY different scenario compared with a more normal grammar in, say, Lancashire or Yorkshire.
For some grammars, the odds aren't greatly stacked against the applicants. For one near us, there are only about 300-400 applicants for 180 places - that's pretty good odds of getting in. For some you need to score 95%+, for one near us, the average is more like a mark of 70-80% to get a place.
Some require a written paper, some even interviews, but plenty just have multiple choice question papers.
Like everything with the UK education system, there's no standardisation - schools are different, catchments are different, 11+ "pass" marks are different, the 11+ exams vary.
What you need to do is forget everything you hear or read, and concentrate on the school(s) itself. Go to the open days, read the prospectus, ask questions. Many schools will show average number of applicants on their websites and the number of places available, they provide sample test papers.
Do your own research and ignore what you may have heard, both pro and anti.