Go get your ACLS Certification, worst case scenario, it will provide you with some additional skills. Most employers won't see you taking the extra effort as a negative quality. As for studying, don't listen to "calivianaya" and her sales pitch on the above mentioned websites, free or not, they have little relevance, and wont do you much good. Do your own research, find your own way, and make sure you get ACLS from an American Heart Association authorized provider.