On Selected, schools can instantaneously become active or inactive as they successfully hire someone or create a new role to fill.
This means that schools that are actively hiring this week can be different than those of last week. This is one benefit over a traditional job board which lists many jobs that may or may not be available.
The best way to see what schools are currently available (and specifically interested in your background) is to make a profile. Doing this is 100% free for teachers. You can also use the site privately by specifying which schools to be hidden from (e.g., your current employer).