Therein lies the uselessness of certifications. If you know how to cram, you will pass. Does this mean you know what you crammed for like the back of your hand? Most likely not.
If I were an employer, the mere mention of a certification would make me administer an on-the-spot exam to verify how much you know.
Am I saying certification is bad? Nope. I have a few myself (by the way, I only have them because my employer at the time required/paid for it

). What I am saying though is, just like it says (paraphrasing) in the Bible, all works (insert, "certifications" here) without faith (insert, "experience", here) is nothing.
If the environment you find yourself in requires a certification in order to make you stand out amongst your peers, go for it. Otherwise, save your time/money, read books and apply what you have read to solving real-world examples. Eventually, you will be like old wine - you'll "taste" better with time.
As always, my 2 cents.