rs21

for the preparation i suggest go for elearning, as you suggest you are working. With elearning you have an advantage, you can study where you want, when you want and how many times you want. There are many well recognized elearning portals these days available on interent.But you have to be cautious in choosing them, because some of the provides dumps material for certification preparation.

So go for sites which provide authorized contents for the certificaiton training. I know some people don't agree with me here on forum. But i found elearning very helpful, at my time.