CLAIT is a computer course, it teaches you the basics of computer usage and is fairly well recognised thing. But it all depends on what sort of job your interesred in, if you were looking for some sort of office work then yes it would be pretty good but if it was say shop work then I think a decent Maths result would be better. On the other hand don't expect CLAIT to give you anything practical, I wouldn't for example give you a foot in the door of any IT job, its too basic and general for that.