You can use it to show that they are not excited about something or they don't like something very much. It doesn't mean the same as "they don't care about something".
They are not keen on education = They don't like education very much.
He is not really keen to go to work today = He doesn't really want to go to work today.
Look at the amendments I made to your post in red. Don't use the multiple full stops (...) - they have a specific use and you weren't using them correctly.