Edit: Yes there is still a chance of scoring high. Everyone stuffs up a SAC or two.. VCE is about improvement, as long as you improve in the next SAC then it's an achievement.. although being a perfectionist is not neccesarily a bad thing and can be a good driving force to working hard it can really stress you out and make you feel like shit when you didn't get the score you expected.. in my view if you are able to improve in your next SAC then that is good and you should be proud of that..
So study hard for your upcoming SACs (trust me there is plenty more to come) and the mid-years and you should do well..
I know it's very easy to give up based on a single SAC but you shouldn't because VCE is not a race it's a marathon, it ain't about how you start it's about your finish.
Good luck and giving that you scored fairly high in your first SAC it shows you have potential to achieve very high again!