The science curriculum is always changing as new areas of study are taken out of or put in. Keeping up with the current science curriculum is a constant challenge.
To keep up to date with the science curriculum you should subscribe to the relevant educational body in your state/ area. All governing bodies should send out notices when the science curriculum changes to let teachers and private science tutors know about the changes.
If you need help with the science curriculum you should consider a private science tutor who will be able to guide you through all current requirements and offer practical tips on how to succeed come exam time.