BCFE art portfolio course preparation help!

Vulpix

Hello:), I am currently in 6th year and I plan on doing an Art portfolio course after the L.C, I have been researching courses and one that I really like is the course offered at Ballyfermot college (Art, Design and Mixed Media portfolio prep.) I read the requirements and it said that you should bring a portfolio to the interview showing 12-18 pieces of work? surely this sounds odd that you must bring a portfolio to a portfolio course interview..Does this mean just bring examples of the work you are capable off? How good does it have to be? It said you can include a sketchbook too but what would you put in it? and how exactly would i present my work at the interview, do I need a portfolio folder? How big should the pages i work on be? Please help somebody, This might seem like a dumb question but I need as much info as possible, please answer I would really appreciate it,