Research facilitating subjects when making your AS choices.
You (normally) take 4 AS subjects, and I would advise at least 2 have to be facilitating. Preferably three (four may be quite a bit for most people, and it won't help considerably as you drop one after AS anyway).
That being said, do not take a subject you are not interested in at all because it's facilitating, and don't let anyone stop you taking a soft subject you are passionate about (you'll probably end up wanting to do it at uni anyway!).