Study your cardiac rhythms! The ECG Skill Stat website is a great resource. A huge part of ACLS is rhythm interpretation and knowing the treatments. Brush up on your BLS skills because these are reviewed and are your fundamental skills. Know the drugs in ACLS (epi, amio, vasopressin, dopa, etc). Study from your book!!
As other users have stated ACLS is fairly straight forward but you really need to know your rhythms and even once your certified you need to review the rhythms frequently to help keep your skills fresh. Best of luck!
in my ACLS class there was a written exam as well as the hands on clinical exam... for the clinical exam, for sure the algorithms and meds/ dosaging. the written portion had some tricky questions (which i actually argued 3 i got wrong, provided my rationale, and then they marked them right...smh), most of which we didnt discuss in class but were in the pre-reading book... for me, it was tough reading the whole book before the class, but if you can it would probably help.