its questions on identification (obviously), generally based on genus, but it can be broader, and there are other questions on habitat, formation (cast, mold, petrifaction, etc.), anatomy, and age. I've also seen questions on geologic time. Also, know your index fossils. You're gonna love youre earth science reference tables (if you dont get these since you dont take a regents if not in new york, print them out online, they really help, trust me. Its a great event, like a mix between rocks and biology.
Fossils: 1st @ reg. 3rd @ states (stupid dinosaurs...) 5th @ nats.
Dynamic: 1st @ reg. 19thish @ states, 18th @ nats
Herpetology (NOT the study of herpes): NA
Enviro Chem: 39th @ states =(
Cell Bio: 9th @ reg. 18th @ nats
Remote: 6th @ states 3rd @ Nats
Ecology: 5th @ Nats